.layer_board_bg,
.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;
	opacity: .5;
}

.layer_board {
	display: none;
	position: fixed;
	top: 50%;
	left: 50%;
	transform: translate(-50%,-50%);
	text-align: center;
	z-index: 2000;
	width: 800px;
}
.layer_board p {
	margin-bottom: 50px
}
.btn_close {
	display: block;
	position: absolute;
	top: -20px;
	right: 10px;
	text-decoration: none;
	text-align: center;
	width: 35px;
	margin: 0 auto
}
@media screen and (max-width: 767px) {
	.layer_board {
		    width: 90%;
	}
	.btn_close {
		    top: -30px;
		width: calc((50 / 750)*100vw);
	}
}