html,body {
height: 100%;
}
* html .layer_board_bg,
* html .layer_board {
position: absolute;
}
.layer_board_bg {
position: fixed;
width: 100%;
height: 100%;
z-index: 1000;
top: 0;
left: 0;
display: none;
cursor: pointer;
background: #000;
}
.layer_board {
display: none;
position: fixed;
width:100%;
padding-top:50px;
text-align: center;
z-index: 2000;
font-size:17px;
line-height:180%;
color:#FFF;
text-align:center;
}
.layer_board  img {
display:inline;
border:none;
margin-top:40px;
}