<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> <style> .top { margin: 0 auto; width: 1000px; /* height: 300px; */ background-color: pink; } .bottom { height: 100px; background-color: green; } .left { float: left; width: 200px; height: 300px; background-color: #ccc; } .right { float: right; width: 790px; height: 300px; background-color: skyblue; } /* 单伪元素清除浮动 和 额外标签法原理是一样的 */ .clearfix::after { content: ''; /* 伪元素添加的标签是行内, 要求块 */ display: block; clear: both; /* 为了兼容性 */ height: 0; visibility: hidden; } </style> </head> <body> <!-- 父子级标签, 子级浮动, 父级没有高度, 后面的标准流盒子会受影响, 显示到上面的位置 --> <div class="top clearfix"> <div class="left"></div> <div class="right"></div> <!-- 通过css 添加标签 --> </div> <div class="bottom"></div> </body> </html>
