body {
	font-family: sans-serif;
}
img {
	display: block;
	max-width: 90vw;
	max-height: 40vh;
	margin: 0 auto 1rem auto;
}
form {
	max-width: 600px;
	margin: 0 auto 1rem auto;
	display: flex;
}
input[name=pattern] {
	flex: 1;
}
pre {
	margin: auto;
}
footer {
	max-width: 900px;
	margin: auto;
	border-top: 1px solid #777;
}