ckface-visibility: hidden;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      text-align: center;
      width: 640px;
      height: 480px;
      position: absolute;
      top: 50%;
      left: 50%;
      margin-top: -240px;
      margin-left: -320px;
      
      -webkit-backface-visibility: hidden;
    	-moz-backface-visibility: hidden;
    	backface-visibility: hidden;
    	-webkit-transform: translate3d(0, 0, 0);
    	-moz-transform: transla