Fix style

This isn't a sure fix, but it works for now (tm).

perf/perf.go

	display: flex;
	position: fixed;
	width: 100vw;
	width: 99.1vw;
	transform: translate(-0.5em, -3em);
	padding: 0.75em;
	margin-bottom: 1em;
	background-color: #222;
	color: #ddd;