body,html{height:100%}* html .layer_board,* html .layer_board_bg{position:absolute}.layer_board_bg{background:#000;cursor:pointer;display:none;height:100%;left:0;position:fixed;top:0;width:100%;z-index:1000}.layer_board{display:none;left:50%;margin:50px 0 0 -285px;position:fixed;text-align:center;z-index:2000}