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;
}
.layer_board {
	display: none;
	position: fixed;
	left: 50%;
	margin: 100px 0px 0px -350px;
	
	text-align: center;
	z-index: 2000;
	border:5px solid #ccc;
	background:#fff;
}
.btn_close{
	background:#F93;
	margin:0!important;
}
.btn_close a{
	display:block;
	padding:5px 0;
}