纯css 实现footer 一直在页面底部，不随页面滚动

html, body, #sticker {height: 100%;}
body > #sticker {height: auto; min-height: 100%;}
#stickerCon {padding-bottom: 40px;}
#footer {margin-:-40px; height: 40px; width: 100%; text-align: center; line-height: 40px; color: #ABA498; font-size: 12px; background: #fafafa; border-:1px solid #E7E7E7;}

<div id="sticker">
<div id="stickerCon"></div>
</div>
<div id="footer">footer</div>