div 绝对屏幕居中

div 绝对屏幕居中

 

 

必须加 <!DOCTYPE 啊!

.div { width:300px; height:400px;

         margin:-200px 0 0 -150px;      //  -200 == height/2

                                                     //  -150 == width/2

        position:absolute; top:50%; left:50%;}

<div class="div"></div>