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: 600px;
	margin: 0 auto;
	display: none;
	position: fixed;
	left: 0;
	right: 0;
	top: 20%;
	text-align: center;
	z-index: 2000;
}
.layer_board .modal_main{
	width: 100%;
	max-width: 600px;
	margin: 0 auto;
}
.layer_board .modal_main img{
	width: 100%;
	max-width: 600px;
}
@media all and (max-width: 668px) {
	.layer_board {
		width: 90%
	}
	.layer_board .modal_main img{
		width: 100%;
	}
}