1. After the last float label, add a new label, its style to the Clear: both-;
2. Add the parent element style overflow: hidden; this method will cut off the extra content can not be displayed overflow elements
3. using double dummy elements before and after the floating Clear
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>image</title>
<style>
* {padding: 0;margin: 0;}
p{float: left;}
.clearfix::before,.clearfix::after {
content: ".";
display: block;
height: 0;
line-height: 0;
visibility: hidden;
clear: both;
}
</style>
</head>
<body>
<div style="border:1px solid green;" class="clearfix">
<p style="width:100px;height:100px;background:red;"></p>
<p style="width:100px;height:100px;background:red;"></p>
<p style="width:100px;height:100px;background:red;"></p>
</div>
</body>
</html>
