html {
	font-size: 62.5%;
}
body {
	margin: 0;
	font-size: 1.5rem;
}
p {
	margin: 0 0 1em;
}
*, *::before, *::after {
	box-sizing: border-box;
	margin: 0;
	padding: 0;
}
.contents {
	max-width: 630px;
	margin: 0 auto;
	padding: 20px;
	background: #f2f2f2;
}
.title {
	margin: 0 0 1em;
	font-weight: bold;
}

.div-parent {
	line-height: 1.5;
	min-height: 100px;
	margin: 0 0 1em;
	background-color: #fff;
}
.span-child-01 {
	background: linear-gradient(transparent 60%, #eae5d6 60%);
}
.span-child-02 {
	background: linear-gradient(transparent 60%, #eae5d6 60%) left bottom 2px;
}
.span-child-03 {
	text-decoration: underline;
	text-decoration-thickness: 0.5em;
	text-decoration-color: #eae5d6;
	text-decoration-skip-ink: none;
}
.span-child-04 {
	text-decoration: underline;
	text-decoration-thickness: 0.5em;
	text-decoration-color: #eae5d6;
	text-underline-offset: -0.2em;
	text-decoration-skip-ink: none;
}

.copyright {
	text-align: center;
	padding-top: 2em;
	font-size: 14px;
}