以下只为占位
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
<style type="text/css">
.box1 {
width: 100%;
height: 100px;
background-color: gray;
/*overflow:hidden;*/
}
.box2 {
width: 100%;
height: 100px;
background-color: black;
}
.box3{
width: 100%;
height: 100px;
background-color: blue;
}
.box4 {
width: 100%;
height: 100px;
background-color: yellow;
}
.con1 {
width: 800px;
height:100%
background-color:red;
margin:auto;
line-height: 100px;
/*float:left;*/
}
</style>
</head>
<body>
<div>
<div>1</div>
</div>
<div></div>
<div></div>
<div></div>
</body>
</html>