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 {
width:700px;
display: none;
position: fixed;
left: 0;
right:0;
margin: 30px auto;
padding:0px;	
text-align: center;
z-index: 2000;
border-radius: 10px;
}

a.btn_close {
display:block;
text-align:right;
font-size:13px;
}