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;
}

.div01 {
	position: sticky;
	top: 0;
	width: 200px;
	margin: 0 0 1em;
	padding: 20px;
	border: 3px solid #000;
	background-color: #ccc;
}

.error01 {
	position: sticky;
	width: 200px;
	margin: 0 0 1em;
	padding: 20px;
	border: 3px solid #000;
	background-color: #ccc;
}

.error02 {
	overflow: hidden;
}

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