body {
	font-family: Roboto, -apple-system, Helvetica Neue, Helvetica, Arial, sans-serif;
	line-height: 1.8em;
	padding: 0px 10px;
}
.content {
	max-width: 768px;
	margin: auto;
}
.c-title {
	font-size: 21px;
}
.s-title {
	font-size: 20px;
	font-weight: 500;
	color: #1976d2;
}
.eg {
	font-style: italic;
	color: #aaa;
}
.text-center {
	text-align: center;
}
/* margin */
.m-b-md {
	margin-bottom: 8px;
}