清除浮动父级塌陷
<head>
<meta charset="UTF-8">
<meta name="author" content="xianwei">
<title>box模型演示</title>
<style>
div.container {
width: 400px;
border: 20px solid;
}
div.box{
box-sizing: border-box;
-moz-box-sizing: border-box;
-webkit-box-sizing: border-box;
width: 50%;
border: 10px solid red;
float: left;
color: blue;
background: chartreuse;
}
div.clearfix::after {
content: "";
display: block;
clear: both;
}
</style>
</head>
<body>
<div class="container clearfix">
<div class="box"> 这个div占据左边 </div>
<div class="box"> 这个div占据右边 </div>
</div>
</body>
