* { margin: 0; padding: 0; list-style: none; }
.lanren { width: 900px; height: auto; margin: 200px auto; }
.lanren .box { width: 200px; height: 100px; margin: 5px; border: 1px solid #ccc; position: relative; float: left; overflow: hidden; }
.lanren .content { position: absolute; z-index: 2; background-color: lightcoral; width: 100%; height: 100%; line-height: 100px; left: -100%; top: -100%; text-align: center; color: #fff; font-size: 40px; }
.lanren .content.trans { -webkit-transition: all .2s; -moz-transition: all .2s; -ms-transition: all .2s; -o-transition: all .2s; transition: all .2s; backface-visibility: hidden; }