.ht1 {display: table; #position: relative; overflow: hidden;width:100%;height:100%} .ht2 {#position: absolute; #top: 50%;display: table-cell; vertical-align: middle;text-align:center;} .ht3 {#position: relative; #top: -50%;margin:0 auto 0 auto;border:1px solid black; width: 800px; height: 450px;}