@CHARSET "UTF-8";body,html{height:100%}body{padding-top:70px}.back{background:#e2e2e2;width:100%;position:fixed;top:0;bottom:0;left:0;z-index:-1}.div-center{width:400px;height:400px;background-color:#fff;position:absolute;top:50%;left:50%;margin-top:-200px;margin-left:-200px;overflow:auto;padding:1em 2em;border-bottom:2px solid #ccc;display:table}div.content{display:table-cell;vertical-align:middle}