body {
	font-family: sans-serif;
}

div.main {
	max-width:55em;
	margin: 0 auto;
}

#result {
	font-family:monospace;
	font-size:.9em;
}

fieldset {
	border-radius:5px;
}

legend {
	font-weight:bold;
}

input[type=number]{
	width:4em;
}

fieldset {
	margin:1em 0;
}