html, body {
	margin: 0;
	padding: 0;
	height: 100%;
}

body {
	font-family: sans-serif;
	background-color: #303030;
	color: rgba(255, 255, 255, 0.84);
}

main {
	max-width: 960px;
	margin: 0 auto;
	padding: 15px;
	text-align: center;
}

h1, h2, h3, h4, h5 {
	font-weight: normal;
}

#visualizer {
	border: 1px solid;
	width: 100%;
	height: 300px;
}

#visualizer audio {
	transition: opacity 0.15s ease-out;
}