Pure CSS implements code that is centered up, down, left, and right_Experience exchange

<style type="text/css"> #box{width:600px; height:400px; border:1px solid red;} #box{position:static; *position:relative; display:table; *display:block; } #box-middle{position:static; *position:absolute; display:table-cell; *display:block; *top:50%; vertical-align:middle; *vertical-align:auto;} #box-inner{position:relative; top:-50%; background-color:blue; margin:0 auto; width:200px; height:100px;} </style> <div id="box"> <div id="box-middle"> <div id="box-inner">content</div> </div> </div>
[Ctrl A Select all Note:If you need to introduce external Js, you need to refresh it to execute]

Finally I saw this abnormal IE7, like fog, rain and wind. It recognizes the CSS hack of IE series: * html; it also recognizes the CSS hack of Firefox: html>body, #id[id], html[xmlns] div, etc. Tell me what it is good for!
Finally solved it with invincibility*!