具有动态高度的CSS和DIV

我有一个这样的网页结构：

<div class="total">
    <div class="menu">
    </div>
    <div class="content">
    </div>
</div>

问题是我无法获得我真正想要的：边框都在顶部，就像一个水平行，我的div没有显示不同的背景色

如何使总div的高度动态化

编辑：链接到“.total”元素已完全折叠，因为它的所有子元素都处于浮动状态。您所需要做的就是添加一个clearfix

清除浮动的其他方法可以在这里找到：

由于其所有子元素都是浮动的，.total元素已完全折叠。您所需要做的就是添加一个clearfix

---

清除浮动的其他方法可在此处找到：

您可以使用clearfix修复此问题：

将其添加到css中，并将cf类添加到div.content中

/**
 * For modern browsers
 * 1. The space content is one way to avoid an Opera bug when the
 *    contenteditable attribute is included anywhere else in the document.
 *    Otherwise it causes space to appear at the top and bottom of elements
 *    that are clearfixed.
 * 2. The use of `table` rather than `block` is only necessary if using
 *    `:before` to contain the top-margins of child elements.
 */
.cf:before,
.cf:after {
    content: " "; /* 1 */
    display: table; /* 2 */
}

.cf:after {
    clear: both;
}

/**
 * For IE 6/7 only
 * Include this rule to trigger hasLayout and contain floats.
 */
.cf {
    *zoom: 1;
}

---

测试：

您可以使用clearfix修复此问题：

将其添加到css中，并将cf类添加到div.content中

/**
 * For modern browsers
 * 1. The space content is one way to avoid an Opera bug when the
 *    contenteditable attribute is included anywhere else in the document.
 *    Otherwise it causes space to appear at the top and bottom of elements
 *    that are clearfixed.
 * 2. The use of `table` rather than `block` is only necessary if using
 *    `:before` to contain the top-margins of child elements.
 */
.cf:before,
.cf:after {
    content: " "; /* 1 */
    display: table; /* 2 */
}

.cf:after {
    clear: both;
}

/**
 * For IE 6/7 only
 * Include this rule to trigger hasLayout and contain floats.
 */
.cf {
    *zoom: 1;
}

---

测试：

他的意思是发布一个在JSFIDLE上不起作用的示例代码，以便对其进行观察和测试以发现问题。比如：这一次是为你做的，所以你知道下一次的问题肯定来自div.menu或div.content的CSS/HTML，我们可以看到CSS吗？他的意思是发布一个在JSFIDLE上不起作用的示例代码，以便可以观察和测试以发现问题。比如：这次是为你做的，所以你知道下一次的问题肯定来自div.menu或div.content的CSS/HTML，我们能看到CSS吗？

/**
 * For modern browsers
 * 1. The space content is one way to avoid an Opera bug when the
 *    contenteditable attribute is included anywhere else in the document.
 *    Otherwise it causes space to appear at the top and bottom of elements
 *    that are clearfixed.
 * 2. The use of `table` rather than `block` is only necessary if using
 *    `:before` to contain the top-margins of child elements.
 */
.cf:before,
.cf:after {
    content: " "; /* 1 */
    display: table; /* 2 */
}

.cf:after {
    clear: both;
}

/**
 * For IE 6/7 only
 * Include this rule to trigger hasLayout and contain floats.
 */
.cf {
    *zoom: 1;
}