<div id="box"> <div id="container"></div> </div>
#box{ position: relative; } #container{ position: absolute; width:30%; height:100px; background: #ccc; left: 0; right: 0; margin:100px auto; }
百分比宽度div如何水平居中
原文：https://www.cnblogs.com/panlaixing/p/8953606.html
