deemix-webui/public/css/modules/track-preview.css

.preview_controls {
	opacity: 0;
	display: block;
	background: rgba(0, 0, 0, 0.5);
	width: 56px;
	height: 56px;
	text-align: center;
	line-height: 56px;
	position: absolute;
	border-radius: 5px;
	top: 0;
	right: 0;
}

.preview_playlist_controls {
	cursor: pointer;
}

a.single-cover {
	position: relative;
	display: inline-block;
	color: white;
}