html {
	font-size: 62.5%;
}
body {
	margin: 0;
	font-size: 1.5rem;
}
h1,
h2,
h3 {
	font-size: 1.5rem;
	margin: 0;
}
p {
	margin: 0 0 1em;
}
ul {
	margin: 0;
}
*, *::before, *::after {
	box-sizing: border-box;
}
.contents {
	max-width: 630px;
	margin: 0 auto;
	padding: 20px;
	background: #f2f2f2;
}
.title {
	margin: 0 0 1em;
	font-weight: bold;
}

.box {
  margin: 0 0 1em;
  padding: 10px;
  background: #fff;
}
h1 + div {
  color: #ff0000;
}
h2 ~ div {
  color: #ff0000;
}
h3 ~ .subtxt {
  color: #ff0000;
}
.list > li:not(:first-child) {
  margin-top: 20px;
}

.copyright {
	text-align: center;
	padding-top: 1em;
	font-size: 14px;
}