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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
*{
margin: 0;
padding: 0;
}
#box1{
width: 200px;
height: 200px;
background: #000;
float: left;
}
#box2{
width: 300px;
height: 300px;
background: yellow;
float: left;
}
#box3{
width: 400px;
height: 400px;
background: green;
float: right;
}
#box4{
width: 100%;
height: 200px;
background: pink;
clear: both;
}
</style>
</head>
<body>
<div id="box1"></div>
<div id="box2"></div>
<div id="box3"></div>
<div id="box4"></div>
</body>
</html>