<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title></title>
<style type="text/css">
#box1{
width: 400px;
height: 500px;
margin-bottom: 30px;
border: 2px solid blue;
text-align: left;
}
#box2{
width: 150px;
height: 450px;
border: 3px solid yellow;
margin-left: 30px;
padding: 2px;
float: left;
}
#box3{
width: 150px;
height: 450px;
margin-left: 20px;
border: 3px solid pink;
margin-right: 20px;
margin-top: -15px;
float: left;
}
</style>
</head>
<body>
<div id="box1">
box1
<div id="box2">box2</div>
<div id="box3">box3</div>
</div>
</html>