ref: https://wiki.c2.com/

wiki.css

body {
	font-size: 12px;
	line-height: 1.5;
}
#page {
	max-width: 500px;
	margin: 15px;
	word-wrap: break-word;
}
h1 {
	display: flex;
	align-items: baseline;
}
h1 span {
	display: inline-block;
	margin: 0 0 0 10px;
}
img, video {
	max-width: 500px;
	width: 100%;
}
pre {
	word-wrap: break-word;
	white-space: pre-wrap;
}
a {
	text-decoration: none;
}
input {
	width: 60%;
}
ul, ol {
	padding-left: 1em;
}
dd {
	margin: 1em;
}