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暂时没时间编辑，直接上代码，以后再一一解释
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport"content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0" />
<title></title>
<style type="text/css">
html,body{
height: 100%;
}
*{
padding: 0px;
margin: 0px;
}
.header,.footer{
font-size: 20px;
font-weight: 800;
width: 100%;
height: 60px;
line-height: 60px;
text-align: center;
color: white;
}
.header{
background: rgba(0,0,0,0.5);
margin-bottom: 10px;
}
.mian{
min-height: 100%;
height: auto !important;
padding-bottom: 60px;
height: 100%;
background: #CECECE;
}
.content{
background: #FFFFFF;
width: 90%;
margin: 0px auto;
box-shadow: 2px 0px 10px #000,
0px 2px 10px #000;
margin-top: 0px;
}
.footer{
background: #FF4F01;
position: relative;
clear:both;
margin-top: -60px;
}
</style>
</head>
<body>
<div class="mian">
<header class="header">
头部
</header>
<div class="content">
<br /><br /><br /><br /><br /><br /><br /><br /><br />
<br /><br /><br /><br /><br /><br /><br /><br /><br />
<br /><br /><br /><br /><br /><br /><br /><br /><br />
<br /><br /><br /><br /><br /><br /><br /><br /><br />
<br /><br /><br /><br /><br /><br /><br /><br /><br />1
</div>
1
</div>
<footer class="footer">
脚部
</footer>
</body>
</html>