div.mainimg {
	background: url(images/header_bg.jpg) no-repeat center center;
	background-size: cover;
	padding: 100px 0;
}

ul.houkibtn {
	display: flex;
	flex-wrap: wrap;
	justify-content: center;
}

ul.houkibtn li {
	margin-bottom: 20px;
}

div.sup {
	background: rgba(236,218,146,.5);
	font-size: 15px;
	margin: auto;
	padding: 10px 80px;
	width: 800px;
}