<!DOCTYPE html>
<html>
<head>
<style>
.container {
border: 1px solid #3bc9db;
border-radius: 5px;
background-color: #e3fafc;
width: 400px;
padding: 5px;
}
.container2::after {
content: "";
display: block;
clear: both;
}
.container3 {
display: flow-root;
}
.item {
height: 100px;
width: 100px;
background-color: #1c87c9;
border: 1px solid #eee;
border-radius: 5px;
float: left;
}
.clear {
clear: both;
}
.wrapper {
max-width: 600px;
margin: 40px auto;
}
</style>
</head>