.clear:after{
/*伪元素是行内元素 正常浏览器清除浮动方法*/
content: "";
display: block;
height: 0;
clear:both;
visibility: hidden;
}
.clear{
zoom: 1; /*兼容IE*/
}
Clear floating classes
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Origin blog.csdn.net/qq_59274685/article/details/120839614
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