Sticky Footer (让页脚永远停靠在页面底部，而不是根据绝对位置)

<div id="wrap">

<div id="main" class="clearfix">

<div id="content">

</div>

<div id="side">

</div>

</div>

</div>

<div id="footer">

</div>

html, body, #wrap {height: 100%;}

body > #wrap {height: auto; min-height: 100%;}

#main {padding-bottom: 150px;} /* 必须使用和footer相同的高度 */

#footer {position: relative;

margin-top: -150px; /* footer高度的负值 */

height: 150px;

clear:both;}

.clearfix:after {content: ".";

display: block;

height: 0;

clear: both;

visibility: hidden;}

.clearfix {display: inline-block;}

/* Hides from IE-mac \*/

* html .clearfix { height: 1%;}

.clearfix {display: block;}

/* End hide from IE-mac */