<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>test</title>
<style type="text/css">
.item{
width:200px;
height: 100px;
background: yellow;
}
.item span{
display: block;
margin: 0 5px;
width:50px;
height: 50px;
background:blue;
float: left;
}
.myc{
background-color: red;
}
</style>
</head>
<body>
<div class="item">
<span class="myc" >11</span>
<span></span>
<span></span>
</div>
</body>
</html>