html{
	font-size: 62.5%;
	box-sizing: border-box;
}
.center_kuro{
	margin: 0 auto 50px;
}
h6{
	width: 750px;
	font-size: 1.8rem;
	border-bottom: #666 solid 1px;
	padding: 10px 10px 10px 30px;
	margin: 0 auto 20px;
	letter-spacing: 0.15em;
}
.otoi_box{
	font-size: 1.4rem;
	width: 790px;
	display: flex;
	margin: 0 auto 50px;
	text-align: justify;
	letter-spacing: 0.1em;
	align-items: center;
}
.otoi_box:last-of-type{
	margin: 0 auto 100px;
}
.otoi_box_text{
	flex-basis: 60%;
	padding: 0 20px;
}
.otoi_box_button{
	flex-basis: 40%;
	display: flex;
	justify-content: center;
}
.otoi_box_button a{
	display: block;
	color: #fff;
	background: #888;
	padding: 5px 20px;
}
.otoi_box_button a:hover{
	background: #ee8f22;
}