CSS堆叠不起作用。z-指数材料

所以我试着把一些东西叠在一起。首先，它将有助于查看工作链接，您将看到问题：

现在我需要使用以下代码：

<div id="blogposts">

        <a><span><strong class="title_blog_mini_post">Post Title</strong></span><img src="images/wp-evential/sample-blog.jpg" width="197" height="134" /></a>
        <a><span><strong class="title_blog_mini_post">Post Title</strong></span><img src="images/wp-evential/sample-blog.jpg" width="197" height="134" /></a>
        <a><span><strong class="title_blog_mini_post">Post Title</strong></span><img src="images/wp-evential/sample-blog.jpg" width="197" height="134" /></a>
        <a><span><strong class="title_blog_mini_post">Post Title</strong></span><img src="images/wp-evential/sample-blog.jpg" width="197" height="134" /></a>
        <a><span><strong class="title_blog_mini_post">Post Title</strong></span><img src="images/wp-evential/sample-blog.jpg" width="197" height="134" /></a>
        <a><span><strong class="title_blog_mini_post">Post Title</strong></span><img src="images/wp-evential/sample-blog.jpg" width="197" height="134" /></a>
        <a><span><strong class="title_blog_mini_post">Post Title</strong></span><img src="images/wp-evential/sample-blog.jpg" width="197" height="134" /></a>
        <a><span><strong class="title_blog_mini_post">Post Title</strong></span><img src="images/wp-evential/sample-blog.jpg" width="197" height="134" /></a>
        <a><span><strong class="title_blog_mini_post">Post Title</strong></span><img src="images/wp-evential/sample-blog.jpg" width="197" height="134" /></a>
        <a><span><strong class="title_blog_mini_post">Post Title</strong></span><img src="images/wp-evential/sample-blog.jpg" width="197" height="134" /></a>

    </div>

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Z索引仅影响位置设置为“绝对”或“固定”的对象。

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默认情况下，位置设置为“相对”，并将忽略“z-index”css属性。

z-index也会影响相对位置-1的元素，这是完全错误的。不仅

z-index

确实影响了@FabrizioCalderan状态下相对定位的元素；

position

的默认值也不是

relative

，而是

static

。我衷心推荐这一点，这无疑帮助我理解了它们的工作原理

#blogposts{width:100%; height:auto; margin-left:8px; margin-top:20px; margin-bottom:30px; float:left; overflow:hidden; } 
#blogposts a{border:1px solid #141414;-webkit-box-shadow: 0px 2px 5px 0px rgba(0, 0, 0, 0.7), inset 0px 0px 1px 1px rgba(255, 255, 255, 0.5);-moz-box-shadow: 0px 2px 5px 0px rgba(0, 0, 0, 0.7), inset 0px 0px 1px 1px rgba(255, 255, 255, 0.5);box-shadow: 0px 2px 5px 0px rgba(0, 0, 0, 0.7), inset 0px 0px 1px 1px rgba(255, 255, 255, 0.5);-webkit-border-radius: 12px;
-moz-border-radius: 12px;border-radius: 12px; margin:10px 18px 9px 5px; width:197px; height:134px; display:block; float:left;} 
#blogposts img{-webkit-border-radius: 11px;width:197px; height:134px; -moz-border-radius: 11px;border-radius: 11px; margin-top:0px; float:left;} 
#blogposts span{z-index: 1000;float: left;bottom:-146px; width:177px; height:114px; background-image:url(images/misc/picoverlay.png); -moz-border-radius: 11px;border-radius: 11px; -webkit-box-shadow: inset 0px 0px 1px 1px rgba(255, 255, 255, 0.3);
-moz-box-shadow: inset 0px 0px 1px 1px rgba(255, 255, 255, 0.3);box-shadow: inset 0px 0px 1px 1px rgba(255, 255, 255, 0.3); padding:10px; font-size:18px; font-family:Georgia, "Times New Roman", Times, serif; font-style:italic; font-weight:bold; border:1px solid #141414;}