html,body {
	height: 100%;
}


* html .layer_board_bg,
* html .layer_board {
	position: absolute;
}

.layer_board_bg {
	position: fixed;
	width: 100%;
	height: 100%;
	
	z-index: 10000;
	
	top: 0;
	left: 0;
	
	display: none;
	cursor: pointer;
	background: #000;
}

.layer_board {
	display: none;
	position: fixed;
	top: 50%;
	left: 50%;
	text-align: center;
	z-index: 20000;
	margin: -150px 0 0 -400px;
}
.btn_close{
	text-align: right;
	margin: 10px 0 0;
	cursor: pointer;
}
@media screen and (max-width: 768px) {
	.layer_board{
		width: 90%;
		top: 50%;
		left: 5%;
		transform:translateY(-50%);
		margin: 0;
	}
	.btn_close{
		width: 18%;
		margin: 0 0 0 auto;
	}
	.btn_close img{
		width: 100%;
		height:auto;
	}
}