<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>解决父盒子高度塌陷</title>
<style>
.chlid{
width: 200px;
height: 200px;
background-color: teal;
border: 1px solid black;
float: left;
}
.patent{
border: 1px solid red;
/*overflow: hidden防止父元素塌陷*/
overflow: hidden; /* 超出的部分隐藏*/
}
</style>
</head>
<body>
<div class="patent">
<div class="chlid">
child
</div>
</div>
</body>
</html>