.box {
	width:		100vw;
	height:		auto;
	min-height:	100vh;
	background-size:	cover;
	background-position:	center;
	background-image:	url('../img/bg_top.jpg');
	display:	-webkit-box;
	display:	-ms-flexbox;
	display:	flex;

	/* 左右中央寄せ */
	-webkit-box-pack:	center;
	-ms-flex-pack:		center;
	justify-content:	flex-start;

	/* 上下中央寄せ */
	-webkit-box-align:	center;
	-ms-flex-align:		center;
	align-items:		flex-start;

	padding:	0px;
	box-sizing:	border-box;

	z-index:	1;

}