伪类清除浮动
1 <!DOCTYPE html> 2 <html> 3 <head> 4 <meta charset="UTF-8"> 5 <title></title> 6 <style> 7 .clear{ 8 zoom: 1;/*兼容IE浏览器,让标签清浮动*/ 9 } 10 .clear:after{ 11 content: ''; 12 display: block; 13 clear: both; 14 height: 0; 15 visibility: hidden; 16 } 17 18 19 .box{ 20 background: yellow; 21 } 22 23 .box1{ 24 width: 50%; 25 height: 200px; 26 background: red; 27 } 28 .box2{ 29 width: 30%; 30 height: 350px; 31 background: darkcyan; 32 } 33 .box div{ 34 float: left; 35 } 36 </style> 37 </head> 38 <body> 39 40 <div class="box clear"> 41 42 <div class="box1"></div> 43 <div class="box2"></div> 44 45 </div> 46 47 48 </body> 49 </html>