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HTML/CSS网页看起来不像它应该的样子

html css user-interface

HTML/CSS网页看起来不像它应该的样子,html,css,user-interface,Html,Css,User Interface,1） 我的导航和旁白不够高。他们不应该从哪里开始，也不应该在什么时候结束 <head> <meta charset="utf-8"> <meta http-equiv="x-ua-compatible" content="ie=edge"> <title>Titulazo</title> <meta name="description" content=""> <meta name="viewpor

1） 我的导航和旁白不够高。他们不应该从哪里开始，也不应该在什么时候结束

<head>
  <meta charset="utf-8">
  <meta http-equiv="x-ua-compatible" content="ie=edge">
  <title>Titulazo</title>
  <meta name="description" content="">
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

  <link rel="manifest" href="site.webmanifest">
  <link rel="apple-touch-icon" href="icon.png">
  <!-- Place favicon.ico in the root directory -->
  <link rel="stylesheet" href="css/normalize.css">
  <link href="style.css" rel="stylesheet">  
  <link rel="stylesheet" href="css/main.css">   

</head>

<body>      
    <header id = "MainHeader">
        <h1>Main Header h1</h1>
        <p>Hello world! This is HTML5 Boilerplate.</p>
    </header>

    <nav>
        <h1>Nav h1</h1>
        <ul>
            <li>bla</li>
            <li>bla</li>
            <li>bla</li>            
        </ul>
    </nav>

    <section>
        <h1>Section h1</h1>
        <header>
            <h1>Section header</h1>
        </header>   

        <article>
            <h1>Article h1</h1>
            <p>Posted on <time datetime="2009-10-22">October 22, 2009</time></p>
            <p>Article text</p>
        </article>

        <footer>
            <h1>Section Footer</h1>
        </footer>
    </section>

    <aside>
        <h1>Aside h1</h1>
        <p>Aside text</p>       
    </aside>

    <footer id = "MainFooter">
        <h1>Main Footer, copyright 2018, Álvaro Puertas</h1>
    </footer>


    <!-- Google Analytics: change UA-XXXXX-Y to be your site's ID. -->
    <script>
    window.ga = function () { ga.q.push(arguments) }; ga.q = []; ga.l = +new Date;
    ga('create', 'UA-XXXXX-Y', 'auto'); ga('send', 'pageview')
    </script>
    <script src="https://www.google-analytics.com/analytics.js" async defer></script>
</body>

</html>
2） 我的部分（以及导航和旁白）不会在页面底部结束

<head>
  <meta charset="utf-8">
  <meta http-equiv="x-ua-compatible" content="ie=edge">
  <title>Titulazo</title>
  <meta name="description" content="">
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

  <link rel="manifest" href="site.webmanifest">
  <link rel="apple-touch-icon" href="icon.png">
  <!-- Place favicon.ico in the root directory -->
  <link rel="stylesheet" href="css/normalize.css">
  <link href="style.css" rel="stylesheet">  
  <link rel="stylesheet" href="css/main.css">   

</head>

<body>      
    <header id = "MainHeader">
        <h1>Main Header h1</h1>
        <p>Hello world! This is HTML5 Boilerplate.</p>
    </header>

    <nav>
        <h1>Nav h1</h1>
        <ul>
            <li>bla</li>
            <li>bla</li>
            <li>bla</li>            
        </ul>
    </nav>

    <section>
        <h1>Section h1</h1>
        <header>
            <h1>Section header</h1>
        </header>   

        <article>
            <h1>Article h1</h1>
            <p>Posted on <time datetime="2009-10-22">October 22, 2009</time></p>
            <p>Article text</p>
        </article>

        <footer>
            <h1>Section Footer</h1>
        </footer>
    </section>

    <aside>
        <h1>Aside h1</h1>
        <p>Aside text</p>       
    </aside>

    <footer id = "MainFooter">
        <h1>Main Footer, copyright 2018, Álvaro Puertas</h1>
    </footer>


    <!-- Google Analytics: change UA-XXXXX-Y to be your site's ID. -->
    <script>
    window.ga = function () { ga.q.push(arguments) }; ga.q = []; ga.l = +new Date;
    ga('create', 'UA-XXXXX-Y', 'auto'); ga('send', 'pageview')
    </script>
    <script src="https://www.google-analytics.com/analytics.js" async defer></script>
</body>

</html>
3） 我的页脚不在页面底部

<head>
  <meta charset="utf-8">
  <meta http-equiv="x-ua-compatible" content="ie=edge">
  <title>Titulazo</title>
  <meta name="description" content="">
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

  <link rel="manifest" href="site.webmanifest">
  <link rel="apple-touch-icon" href="icon.png">
  <!-- Place favicon.ico in the root directory -->
  <link rel="stylesheet" href="css/normalize.css">
  <link href="style.css" rel="stylesheet">  
  <link rel="stylesheet" href="css/main.css">   

</head>

<body>      
    <header id = "MainHeader">
        <h1>Main Header h1</h1>
        <p>Hello world! This is HTML5 Boilerplate.</p>
    </header>

    <nav>
        <h1>Nav h1</h1>
        <ul>
            <li>bla</li>
            <li>bla</li>
            <li>bla</li>            
        </ul>
    </nav>

    <section>
        <h1>Section h1</h1>
        <header>
            <h1>Section header</h1>
        </header>   

        <article>
            <h1>Article h1</h1>
            <p>Posted on <time datetime="2009-10-22">October 22, 2009</time></p>
            <p>Article text</p>
        </article>

        <footer>
            <h1>Section Footer</h1>
        </footer>
    </section>

    <aside>
        <h1>Aside h1</h1>
        <p>Aside text</p>       
    </aside>

    <footer id = "MainFooter">
        <h1>Main Footer, copyright 2018, Álvaro Puertas</h1>
    </footer>


    <!-- Google Analytics: change UA-XXXXX-Y to be your site's ID. -->
    <script>
    window.ga = function () { ga.q.push(arguments) }; ga.q = []; ga.l = +new Date;
    ga('create', 'UA-XXXXX-Y', 'auto'); ga('send', 'pageview')
    </script>
    <script src="https://www.google-analytics.com/analytics.js" async defer></script>
</body>

</html>
我正在使用HTML和CSS。我目前正在使用谷歌浏览器

<head>
  <meta charset="utf-8">
  <meta http-equiv="x-ua-compatible" content="ie=edge">
  <title>Titulazo</title>
  <meta name="description" content="">
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

  <link rel="manifest" href="site.webmanifest">
  <link rel="apple-touch-icon" href="icon.png">
  <!-- Place favicon.ico in the root directory -->
  <link rel="stylesheet" href="css/normalize.css">
  <link href="style.css" rel="stylesheet">  
  <link rel="stylesheet" href="css/main.css">   

</head>

<body>      
    <header id = "MainHeader">
        <h1>Main Header h1</h1>
        <p>Hello world! This is HTML5 Boilerplate.</p>
    </header>

    <nav>
        <h1>Nav h1</h1>
        <ul>
            <li>bla</li>
            <li>bla</li>
            <li>bla</li>            
        </ul>
    </nav>

    <section>
        <h1>Section h1</h1>
        <header>
            <h1>Section header</h1>
        </header>   

        <article>
            <h1>Article h1</h1>
            <p>Posted on <time datetime="2009-10-22">October 22, 2009</time></p>
            <p>Article text</p>
        </article>

        <footer>
            <h1>Section Footer</h1>
        </footer>
    </section>

    <aside>
        <h1>Aside h1</h1>
        <p>Aside text</p>       
    </aside>

    <footer id = "MainFooter">
        <h1>Main Footer, copyright 2018, Álvaro Puertas</h1>
    </footer>


    <!-- Google Analytics: change UA-XXXXX-Y to be your site's ID. -->
    <script>
    window.ga = function () { ga.q.push(arguments) }; ga.q = []; ga.l = +new Date;
    ga('create', 'UA-XXXXX-Y', 'auto'); ga('send', 'pageview')
    </script>
    <script src="https://www.google-analytics.com/analytics.js" async defer></script>
</body>

</html>
我希望我的页面如下所示：

<head>
  <meta charset="utf-8">
  <meta http-equiv="x-ua-compatible" content="ie=edge">
  <title>Titulazo</title>
  <meta name="description" content="">
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

  <link rel="manifest" href="site.webmanifest">
  <link rel="apple-touch-icon" href="icon.png">
  <!-- Place favicon.ico in the root directory -->
  <link rel="stylesheet" href="css/normalize.css">
  <link href="style.css" rel="stylesheet">  
  <link rel="stylesheet" href="css/main.css">   

</head>

<body>      
    <header id = "MainHeader">
        <h1>Main Header h1</h1>
        <p>Hello world! This is HTML5 Boilerplate.</p>
    </header>

    <nav>
        <h1>Nav h1</h1>
        <ul>
            <li>bla</li>
            <li>bla</li>
            <li>bla</li>            
        </ul>
    </nav>

    <section>
        <h1>Section h1</h1>
        <header>
            <h1>Section header</h1>
        </header>   

        <article>
            <h1>Article h1</h1>
            <p>Posted on <time datetime="2009-10-22">October 22, 2009</time></p>
            <p>Article text</p>
        </article>

        <footer>
            <h1>Section Footer</h1>
        </footer>
    </section>

    <aside>
        <h1>Aside h1</h1>
        <p>Aside text</p>       
    </aside>

    <footer id = "MainFooter">
        <h1>Main Footer, copyright 2018, Álvaro Puertas</h1>
    </footer>


    <!-- Google Analytics: change UA-XXXXX-Y to be your site's ID. -->
    <script>
    window.ga = function () { ga.q.push(arguments) }; ga.q = []; ga.l = +new Date;
    ga('create', 'UA-XXXXX-Y', 'auto'); ga('send', 'pageview')
    </script>
    <script src="https://www.google-analytics.com/analytics.js" async defer></script>
</body>

</html>

body{
    width:100%;
    position:absolute;
    height:auto; 
}

header#MainHeader{  
    width: auto;
    height: auto;
    background-color: orange;
    margin: 20px;        
 } 

nav { 
  position: relative;
  float: left;
  height: auto;  
  width:200px;
  margin: 20px;
  top: 0px;
  background-color: lightblue;
  bottom: 0px;
}

section{
    width: 900px;
    height: auto; 
    float: left;    
    top: 500px;
    background-color: pink; 
}

aside{
    width: 200px;
    height: 100%;
    margin: 20px;
    top: 0px;
    float: right;
    background-color: lightgreen;   
}

footer#MainFooter{
    width: auto;
    height: auto;   
    background-color: gray;

    margin: 20px;   
    clear:both; 
}


<head>
  <meta charset="utf-8">
  <meta http-equiv="x-ua-compatible" content="ie=edge">
  <title>Titulazo</title>
  <meta name="description" content="">
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

  <link rel="manifest" href="site.webmanifest">
  <link rel="apple-touch-icon" href="icon.png">
  <!-- Place favicon.ico in the root directory -->
  <link rel="stylesheet" href="css/normalize.css">
  <link href="style.css" rel="stylesheet">  
  <link rel="stylesheet" href="css/main.css">   

</head>

<body>      
    <header id = "MainHeader">
        <h1>Main Header h1</h1>
        <p>Hello world! This is HTML5 Boilerplate.</p>
    </header>

    <nav>
        <h1>Nav h1</h1>
        <ul>
            <li>bla</li>
            <li>bla</li>
            <li>bla</li>            
        </ul>
    </nav>

    <section>
        <h1>Section h1</h1>
        <header>
            <h1>Section header</h1>
        </header>   

        <article>
            <h1>Article h1</h1>
            <p>Posted on <time datetime="2009-10-22">October 22, 2009</time></p>
            <p>Article text</p>
        </article>

        <footer>
            <h1>Section Footer</h1>
        </footer>
    </section>

    <aside>
        <h1>Aside h1</h1>
        <p>Aside text</p>       
    </aside>

    <footer id = "MainFooter">
        <h1>Main Footer, copyright 2018, Álvaro Puertas</h1>
    </footer>


    <!-- Google Analytics: change UA-XXXXX-Y to be your site's ID. -->
    <script>
    window.ga = function () { ga.q.push(arguments) }; ga.q = []; ga.l = +new Date;
    ga('create', 'UA-XXXXX-Y', 'auto'); ga('send', 'pageview')
    </script>
    <script src="https://www.google-analytics.com/analytics.js" async defer></script>
</body>

</html>
它看起来是这样的： 

<head>
  <meta charset="utf-8">
  <meta http-equiv="x-ua-compatible" content="ie=edge">
  <title>Titulazo</title>
  <meta name="description" content="">
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

  <link rel="manifest" href="site.webmanifest">
  <link rel="apple-touch-icon" href="icon.png">
  <!-- Place favicon.ico in the root directory -->
  <link rel="stylesheet" href="css/normalize.css">
  <link href="style.css" rel="stylesheet">  
  <link rel="stylesheet" href="css/main.css">   

</head>

<body>      
    <header id = "MainHeader">
        <h1>Main Header h1</h1>
        <p>Hello world! This is HTML5 Boilerplate.</p>
    </header>

    <nav>
        <h1>Nav h1</h1>
        <ul>
            <li>bla</li>
            <li>bla</li>
            <li>bla</li>            
        </ul>
    </nav>

    <section>
        <h1>Section h1</h1>
        <header>
            <h1>Section header</h1>
        </header>   

        <article>
            <h1>Article h1</h1>
            <p>Posted on <time datetime="2009-10-22">October 22, 2009</time></p>
            <p>Article text</p>
        </article>

        <footer>
            <h1>Section Footer</h1>
        </footer>
    </section>

    <aside>
        <h1>Aside h1</h1>
        <p>Aside text</p>       
    </aside>

    <footer id = "MainFooter">
        <h1>Main Footer, copyright 2018, Álvaro Puertas</h1>
    </footer>


    <!-- Google Analytics: change UA-XXXXX-Y to be your site's ID. -->
    <script>
    window.ga = function () { ga.q.push(arguments) }; ga.q = []; ga.l = +new Date;
    ga('create', 'UA-XXXXX-Y', 'auto'); ga('send', 'pageview')
    </script>
    <script src="https://www.google-analytics.com/analytics.js" async defer></script>
</body>

</html>
HTTP: 

<head>
  <meta charset="utf-8">
  <meta http-equiv="x-ua-compatible" content="ie=edge">
  <title>Titulazo</title>
  <meta name="description" content="">
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

  <link rel="manifest" href="site.webmanifest">
  <link rel="apple-touch-icon" href="icon.png">
  <!-- Place favicon.ico in the root directory -->
  <link rel="stylesheet" href="css/normalize.css">
  <link href="style.css" rel="stylesheet">  
  <link rel="stylesheet" href="css/main.css">   

</head>

<body>      
    <header id = "MainHeader">
        <h1>Main Header h1</h1>
        <p>Hello world! This is HTML5 Boilerplate.</p>
    </header>

    <nav>
        <h1>Nav h1</h1>
        <ul>
            <li>bla</li>
            <li>bla</li>
            <li>bla</li>            
        </ul>
    </nav>

    <section>
        <h1>Section h1</h1>
        <header>
            <h1>Section header</h1>
        </header>   

        <article>
            <h1>Article h1</h1>
            <p>Posted on <time datetime="2009-10-22">October 22, 2009</time></p>
            <p>Article text</p>
        </article>

        <footer>
            <h1>Section Footer</h1>
        </footer>
    </section>

    <aside>
        <h1>Aside h1</h1>
        <p>Aside text</p>       
    </aside>

    <footer id = "MainFooter">
        <h1>Main Footer, copyright 2018, Álvaro Puertas</h1>
    </footer>


    <!-- Google Analytics: change UA-XXXXX-Y to be your site's ID. -->
    <script>
    window.ga = function () { ga.q.push(arguments) }; ga.q = []; ga.l = +new Date;
    ga('create', 'UA-XXXXX-Y', 'auto'); ga('send', 'pageview')
    </script>
    <script src="https://www.google-analytics.com/analytics.js" async defer></script>
</body>

</html>
1） 我的导航和旁白不够高。他们不会从他们想要的地方开始 也不应该在应该结束的时候结束

<head>
  <meta charset="utf-8">
  <meta http-equiv="x-ua-compatible" content="ie=edge">
  <title>Titulazo</title>
  <meta name="description" content="">
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

  <link rel="manifest" href="site.webmanifest">
  <link rel="apple-touch-icon" href="icon.png">
  <!-- Place favicon.ico in the root directory -->
  <link rel="stylesheet" href="css/normalize.css">
  <link href="style.css" rel="stylesheet">  
  <link rel="stylesheet" href="css/main.css">   

</head>

<body>      
    <header id = "MainHeader">
        <h1>Main Header h1</h1>
        <p>Hello world! This is HTML5 Boilerplate.</p>
    </header>

    <nav>
        <h1>Nav h1</h1>
        <ul>
            <li>bla</li>
            <li>bla</li>
            <li>bla</li>            
        </ul>
    </nav>

    <section>
        <h1>Section h1</h1>
        <header>
            <h1>Section header</h1>
        </header>   

        <article>
            <h1>Article h1</h1>
            <p>Posted on <time datetime="2009-10-22">October 22, 2009</time></p>
            <p>Article text</p>
        </article>

        <footer>
            <h1>Section Footer</h1>
        </footer>
    </section>

    <aside>
        <h1>Aside h1</h1>
        <p>Aside text</p>       
    </aside>

    <footer id = "MainFooter">
        <h1>Main Footer, copyright 2018, Álvaro Puertas</h1>
    </footer>


    <!-- Google Analytics: change UA-XXXXX-Y to be your site's ID. -->
    <script>
    window.ga = function () { ga.q.push(arguments) }; ga.q = []; ga.l = +new Date;
    ga('create', 'UA-XXXXX-Y', 'auto'); ga('send', 'pageview')
    </script>
    <script src="https://www.google-analytics.com/analytics.js" async defer></script>
</body>

</html>
  • 增加高度：100%至车身、导航和侧边；移除位置：身体绝对位置；同时删除位置：相对于导航、剖面和旁侧，因为它们是使用浮动定位的，所以最好使用边距来定位它们，而不是相对/绝对位置。移除/替换导航和侧边的边距：20px（边距：0 20px），使其从相同的垂直位置开始
2） 我的部分（以及导航和旁白）不会在页面底部结束

<head>
  <meta charset="utf-8">
  <meta http-equiv="x-ua-compatible" content="ie=edge">
  <title>Titulazo</title>
  <meta name="description" content="">
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

  <link rel="manifest" href="site.webmanifest">
  <link rel="apple-touch-icon" href="icon.png">
  <!-- Place favicon.ico in the root directory -->
  <link rel="stylesheet" href="css/normalize.css">
  <link href="style.css" rel="stylesheet">  
  <link rel="stylesheet" href="css/main.css">   

</head>

<body>      
    <header id = "MainHeader">
        <h1>Main Header h1</h1>
        <p>Hello world! This is HTML5 Boilerplate.</p>
    </header>

    <nav>
        <h1>Nav h1</h1>
        <ul>
            <li>bla</li>
            <li>bla</li>
            <li>bla</li>            
        </ul>
    </nav>

    <section>
        <h1>Section h1</h1>
        <header>
            <h1>Section header</h1>
        </header>   

        <article>
            <h1>Article h1</h1>
            <p>Posted on <time datetime="2009-10-22">October 22, 2009</time></p>
            <p>Article text</p>
        </article>

        <footer>
            <h1>Section Footer</h1>
        </footer>
    </section>

    <aside>
        <h1>Aside h1</h1>
        <p>Aside text</p>       
    </aside>

    <footer id = "MainFooter">
        <h1>Main Footer, copyright 2018, Álvaro Puertas</h1>
    </footer>


    <!-- Google Analytics: change UA-XXXXX-Y to be your site's ID. -->
    <script>
    window.ga = function () { ga.q.push(arguments) }; ga.q = []; ga.l = +new Date;
    ga('create', 'UA-XXXXX-Y', 'auto'); ga('send', 'pageview')
    </script>
    <script src="https://www.google-analytics.com/analytics.js" async defer></script>
</body>

</html>
  • 不要忘记清除浮动导航、剖面和旁侧
3） 我的页脚不在页面底部

<head>
  <meta charset="utf-8">
  <meta http-equiv="x-ua-compatible" content="ie=edge">
  <title>Titulazo</title>
  <meta name="description" content="">
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

  <link rel="manifest" href="site.webmanifest">
  <link rel="apple-touch-icon" href="icon.png">
  <!-- Place favicon.ico in the root directory -->
  <link rel="stylesheet" href="css/normalize.css">
  <link href="style.css" rel="stylesheet">  
  <link rel="stylesheet" href="css/main.css">   

</head>

<body>      
    <header id = "MainHeader">
        <h1>Main Header h1</h1>
        <p>Hello world! This is HTML5 Boilerplate.</p>
    </header>

    <nav>
        <h1>Nav h1</h1>
        <ul>
            <li>bla</li>
            <li>bla</li>
            <li>bla</li>            
        </ul>
    </nav>

    <section>
        <h1>Section h1</h1>
        <header>
            <h1>Section header</h1>
        </header>   

        <article>
            <h1>Article h1</h1>
            <p>Posted on <time datetime="2009-10-22">October 22, 2009</time></p>
            <p>Article text</p>
        </article>

        <footer>
            <h1>Section Footer</h1>
        </footer>
    </section>

    <aside>
        <h1>Aside h1</h1>
        <p>Aside text</p>       
    </aside>

    <footer id = "MainFooter">
        <h1>Main Footer, copyright 2018, Álvaro Puertas</h1>
    </footer>


    <!-- Google Analytics: change UA-XXXXX-Y to be your site's ID. -->
    <script>
    window.ga = function () { ga.q.push(arguments) }; ga.q = []; ga.l = +new Date;
    ga('create', 'UA-XXXXX-Y', 'auto'); ga('send', 'pageview')
    </script>
    <script src="https://www.google-analytics.com/analytics.js" async defer></script>
</body>

</html>
  • 将高度：100%添加到html标记中，并将页脚定位为绝对或固定，具体取决于底部为0的要求，注意当页脚区域溢出时，导航、剖面和侧边会发生什么情况
您应该通过添加以下内容来修复页脚位置：

<head>
  <meta charset="utf-8">
  <meta http-equiv="x-ua-compatible" content="ie=edge">
  <title>Titulazo</title>
  <meta name="description" content="">
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

  <link rel="manifest" href="site.webmanifest">
  <link rel="apple-touch-icon" href="icon.png">
  <!-- Place favicon.ico in the root directory -->
  <link rel="stylesheet" href="css/normalize.css">
  <link href="style.css" rel="stylesheet">  
  <link rel="stylesheet" href="css/main.css">   

</head>

<body>      
    <header id = "MainHeader">
        <h1>Main Header h1</h1>
        <p>Hello world! This is HTML5 Boilerplate.</p>
    </header>

    <nav>
        <h1>Nav h1</h1>
        <ul>
            <li>bla</li>
            <li>bla</li>
            <li>bla</li>            
        </ul>
    </nav>

    <section>
        <h1>Section h1</h1>
        <header>
            <h1>Section header</h1>
        </header>   

        <article>
            <h1>Article h1</h1>
            <p>Posted on <time datetime="2009-10-22">October 22, 2009</time></p>
            <p>Article text</p>
        </article>

        <footer>
            <h1>Section Footer</h1>
        </footer>
    </section>

    <aside>
        <h1>Aside h1</h1>
        <p>Aside text</p>       
    </aside>

    <footer id = "MainFooter">
        <h1>Main Footer, copyright 2018, Álvaro Puertas</h1>
    </footer>


    <!-- Google Analytics: change UA-XXXXX-Y to be your site's ID. -->
    <script>
    window.ga = function () { ga.q.push(arguments) }; ga.q = []; ga.l = +new Date;
    ga('create', 'UA-XXXXX-Y', 'auto'); ga('send', 'pageview')
    </script>
    <script src="https://www.google-analytics.com/analytics.js" async defer></script>
</body>

</html>

position:fixed;
left:0px;
bottom:0px;
到页脚的CSS

<head>
  <meta charset="utf-8">
  <meta http-equiv="x-ua-compatible" content="ie=edge">
  <title>Titulazo</title>
  <meta name="description" content="">
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

  <link rel="manifest" href="site.webmanifest">
  <link rel="apple-touch-icon" href="icon.png">
  <!-- Place favicon.ico in the root directory -->
  <link rel="stylesheet" href="css/normalize.css">
  <link href="style.css" rel="stylesheet">  
  <link rel="stylesheet" href="css/main.css">   

</head>

<body>      
    <header id = "MainHeader">
        <h1>Main Header h1</h1>
        <p>Hello world! This is HTML5 Boilerplate.</p>
    </header>

    <nav>
        <h1>Nav h1</h1>
        <ul>
            <li>bla</li>
            <li>bla</li>
            <li>bla</li>            
        </ul>
    </nav>

    <section>
        <h1>Section h1</h1>
        <header>
            <h1>Section header</h1>
        </header>   

        <article>
            <h1>Article h1</h1>
            <p>Posted on <time datetime="2009-10-22">October 22, 2009</time></p>
            <p>Article text</p>
        </article>

        <footer>
            <h1>Section Footer</h1>
        </footer>
    </section>

    <aside>
        <h1>Aside h1</h1>
        <p>Aside text</p>       
    </aside>

    <footer id = "MainFooter">
        <h1>Main Footer, copyright 2018, Álvaro Puertas</h1>
    </footer>


    <!-- Google Analytics: change UA-XXXXX-Y to be your site's ID. -->
    <script>
    window.ga = function () { ga.q.push(arguments) }; ga.q = []; ga.l = +new Date;
    ga('create', 'UA-XXXXX-Y', 'auto'); ga('send', 'pageview')
    </script>
    <script src="https://www.google-analytics.com/analytics.js" async defer></script>
</body>

</html>
对于您的导航和旁白，您应该将position:absolute从body中删除，并将导航高度更改为100%

尝试添加以下css:final output：

<head>
  <meta charset="utf-8">
  <meta http-equiv="x-ua-compatible" content="ie=edge">
  <title>Titulazo</title>
  <meta name="description" content="">
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

  <link rel="manifest" href="site.webmanifest">
  <link rel="apple-touch-icon" href="icon.png">
  <!-- Place favicon.ico in the root directory -->
  <link rel="stylesheet" href="css/normalize.css">
  <link href="style.css" rel="stylesheet">  
  <link rel="stylesheet" href="css/main.css">   

</head>

<body>      
    <header id = "MainHeader">
        <h1>Main Header h1</h1>
        <p>Hello world! This is HTML5 Boilerplate.</p>
    </header>

    <nav>
        <h1>Nav h1</h1>
        <ul>
            <li>bla</li>
            <li>bla</li>
            <li>bla</li>            
        </ul>
    </nav>

    <section>
        <h1>Section h1</h1>
        <header>
            <h1>Section header</h1>
        </header>   

        <article>
            <h1>Article h1</h1>
            <p>Posted on <time datetime="2009-10-22">October 22, 2009</time></p>
            <p>Article text</p>
        </article>

        <footer>
            <h1>Section Footer</h1>
        </footer>
    </section>

    <aside>
        <h1>Aside h1</h1>
        <p>Aside text</p>       
    </aside>

    <footer id = "MainFooter">
        <h1>Main Footer, copyright 2018, Álvaro Puertas</h1>
    </footer>


    <!-- Google Analytics: change UA-XXXXX-Y to be your site's ID. -->
    <script>
    window.ga = function () { ga.q.push(arguments) }; ga.q = []; ga.l = +new Date;
    ga('create', 'UA-XXXXX-Y', 'auto'); ga('send', 'pageview')
    </script>
    <script src="https://www.google-analytics.com/analytics.js" async defer></script>
</body>

</html>
这不是最好的办法。我建议您学习引导网格布局，并学习使用chrome开发工具。

给页脚一个
固定的
位置将使其变得粘乎乎的。如果OP不这样指定，我不会认为这是所需的行为。请阅读响应式设计教程或使用css框架

<head>
  <meta charset="utf-8">
  <meta http-equiv="x-ua-compatible" content="ie=edge">
  <title>Titulazo</title>
  <meta name="description" content="">
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

  <link rel="manifest" href="site.webmanifest">
  <link rel="apple-touch-icon" href="icon.png">
  <!-- Place favicon.ico in the root directory -->
  <link rel="stylesheet" href="css/normalize.css">
  <link href="style.css" rel="stylesheet">  
  <link rel="stylesheet" href="css/main.css">   

</head>

<body>      
    <header id = "MainHeader">
        <h1>Main Header h1</h1>
        <p>Hello world! This is HTML5 Boilerplate.</p>
    </header>

    <nav>
        <h1>Nav h1</h1>
        <ul>
            <li>bla</li>
            <li>bla</li>
            <li>bla</li>            
        </ul>
    </nav>

    <section>
        <h1>Section h1</h1>
        <header>
            <h1>Section header</h1>
        </header>   

        <article>
            <h1>Article h1</h1>
            <p>Posted on <time datetime="2009-10-22">October 22, 2009</time></p>
            <p>Article text</p>
        </article>

        <footer>
            <h1>Section Footer</h1>
        </footer>
    </section>

    <aside>
        <h1>Aside h1</h1>
        <p>Aside text</p>       
    </aside>

    <footer id = "MainFooter">
        <h1>Main Footer, copyright 2018, Álvaro Puertas</h1>
    </footer>


    <!-- Google Analytics: change UA-XXXXX-Y to be your site's ID. -->
    <script>
    window.ga = function () { ga.q.push(arguments) }; ga.q = []; ga.l = +new Date;
    ga('create', 'UA-XXXXX-Y', 'auto'); ga('send', 'pageview')
    </script>
    <script src="https://www.google-analytics.com/analytics.js" async defer></script>
</body>

</html>