【Css】position属性示例

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<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=Edge">
    <title>Title</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        .level1 {
            padding-top: 10px;
            background-color: red;
            height: 70px;
        }

        .level2 {
            background-color: #3dff26;
            height: 50px;
        }

        .level3-0 {
            background-color: black;
            color:white;
            height: 30px;
            /*这里为什么需要设置width的长度是因为,block-level的元素的宽度默认继承父元素的,因为当前是相对于document,document的长度为0,所以这里需要显示指定*/
            width: 200px;
            position: absolute;
            top: 0px;
        }

        .level3-1 {
            background-color: #fdfbff;
            position: relative;
            top: 20px;
            left: 20px;
        }

        .level3-2 {
            background-color: #0fa4ff;
            height: 20px;
        }

        .level4 {
            position: fixed;
            /*默认的top, left,bottom,right 的值实现相对于包含的元素的,通常需要进行显示的设置*/
            right: 0px;
            background-color: #dd6149;
        }
    </style>
</head>
<body>
<div class="level1">
    <div class="level2">
        <div class="level3-0">level 3-0</div>
        <div class="level3-1">level 3-1</div>
        <div class="level3-2">
            level 3-2
            <div class="level4">level 4</div>
        </div>
    </div>
</div>
</body>
</html>

页面效果:
这里写图片描述

参考:
1. Css Tricks Position
2. Default Top/Right/Bottom/Left value for position:fixed

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转载自blog.csdn.net/heiyouhei123/article/details/82017608