* {
	box-sizing: border-box;
}

body {
	margin: 12px;
}

body > div {
	margin-bottom: 12px;
}

button {
	display: inline-block;
	padding: 0px;
	border: 1px solid #666;
	width: 50px;
	height: 32px;
	background: #ddd;
	margin-left: 2px;
	margin-right: 2px;
}

button:active,
button.active {
	background: #aaa;
}

progress {
	width: 100%;
	height: 24px;
}

input[type="range"] {
	border: 1px solid rgba(0, 0, 0, 0);
	box-sizing: border-box;
	margin: 0px;
	width: 100%;
}

#is-playing,
#progress-text {
	display: inline-block;
}
#progress-text {
	float: right;
}

#group-buttons {
	text-align: center;
}