.introduction {
	margin-bottom: 2em;
	margin-top: 2em;
}
.introduction h2 {
	font-size: 100%;
	color: #FF0080;
	margin-bottom: 1em;
	margin-top: 1em;
}
.shousai {
	padding-bottom: 1em;
	padding-top: 2em;
	border-top-width: 1px;
	border-top-style: dashed;
	border-top-color: #BFDFFF;
}