How to clear float in css

1. Set the height of the parent element

Rendering:

Code:

<style>
    * {
        padding: 0;
        margin: 0;
    }
    .header {
        height: 30px;
        line-height: 30px;
        background-color: #333;
    }
    .header a {
        color: #fff;
        text-decoration: none;
    }
    ul {
        float: right;
    }
    li {
        float: left;
        list-style: none;
        padding-right: 20px;
    }
</style>
 
<div class="header">
    <ul>
        <li><a href="#">首页</a></li>
        <li><a href="#">文章</a></li>
        <li><a href="#">问答</a></li>
        <li><a href="#">帮助</a></li>
        <li><a href="#">关于</a></li>
    </ul>
</div>

(Recommended tutorial: CSS Getting Started Tutorial)

2. Exterior wall method: Use a blank block-level element to add css style clear to clear float

Note: Block-level elements with clear style cannot be added with margin attributes

Rendering:

Code:

<style>
    * {
        padding: 0;
        margin: 0;
    }
    .header {
        /* background-color: #333; */
    }
    .header a {
        /* color: #fff; */
        text-decoration: none;
    }
    ul {
        float: right;
    }
    li {
        float: left;
        list-style: none;
        padding: 5px 20px;
    }
 
    .clearfix {
        height: 10px;
        background-color: red;
        clear: both;
    }
 
    .main {
        color: #fff;
        height: 100px;
        background-color: blue;
    }
</style>
 
<div class="header">
    <ul>
        <li><a href="#">首页</a></li>
        <li><a href="#">文章</a></li>
        <li><a href="#">问答</a></li>
        <li><a href="#">帮助</a></li>
        <li><a href="#">关于</a></li>
    </ul>
     
</div>
 
<div class="clearfix"></div>
     
<div class="main">主要内容</div>

3. Inner Wall method: Use a blank block-level element to add css style clear to clear the float

Rendering:

Code:

<style>
    * {
        padding: 0;
        margin: 0;
    }
    .header {
        background-color: #333;
    }
    .header a {
        color: #fff;
        text-decoration: none;
    }
    ul {
        float: right;
    }
    li {
        float: left;
        list-style: none;
        padding: 5px 20px;
    }
    .clearfix {
        clear: both;
    }
</style>
 
<div class="header">
    <ul>
        <li><a href="#">首页</a></li>
        <li><a href="#">文章</a></li>
        <li><a href="#">问答</a></li>
        <li><a href="#">帮助</a></li>
        <li><a href="#">关于</a></li>
    </ul>
    <div class="clearfix"></div>
</div>

The wall method has relative advantages over the exterior wall method:

After the interior wall method is set, the parent element of the floating element will be stretched, which means it has a height.

4. Give the floating element Add overflow:hidden to the parent element Net

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