<!DOCTYPE html>
<html>
<head>
<title></title>
<style type="text/css">
*{
padding: 0;
margin: 0;
}
.s1{
width: 100px;
height: 100px;
border: 1px solid black;
float: left;
}
.s2{
width: 100px;
height: 100px;
background-color: yellow;
border: 1px solid red;
}
}
</style>
</head>
<body>
<div class="s1">盒子1</div>
<div class="s2">盒子2</div>
</body>
</html>