CSS3 垂直居中 左右居中

display: -webkit-box;
-webkit-box-orient: horizontal;
-webkit-box-pack: center;
-webkit-box-align: center;

display: -moz-box;
-moz-box-orient: horizontal;
-moz-box-pack: center;
-moz-box-align: center;

display: -o-box;
-o-box-orient: horizontal;
-o-box-pack: center;
-o-box-align: center;

display: -ms-box;
-ms-box-orient: horizontal;
-ms-box-pack: center;
-ms-box-align: center;

display: box;
box-orient: horizontal;
box-pack: center;
box-align: center;