piskel/resources/proto-ui-1/main.css

body {
	margin: 0;
	font-family: "HelveticaNeue-Light", "Helvetica Neue Light", "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; 
	font-weight: 300;
}

.main-wrapper {
  padding: 10px;
  position: absolute;
  top:0; right: 0; bottom: 0; left: 0;
  background: -webkit-radial-gradient(circle, #000, #373737);
}

.tools {
	float: left;
	width: 100px;
	margin-right: 10px;
	height: 100%;
}

.tool {
	position: relative;
	float: left;
	height: 46px;
	width: 46px;
	background: no-repeat url(img/magicwand-icon.png);
	background-size: 34px 34px;
	background-position-x: 6px;
	background-position-y: 6px;
	background-color: rgba(200,200,200, .1);
	margin: 1px;
}

.tool.selected,
.tool:hover {
	cursor: pointer;
	background-color: rgba(240,200,230, .3);
}

.tool.has-group:after {
	content: " ";
	position: absolute;
	bottom: 2px;
	right: 2px;
	width: 0;
	height: 0;
	border: 4px #eee solid;
	border-top-color: transparent;
	border-left-color: transparent;
}

.tool.has-group:hover:after {
	border-color: gold;
	border-top-color: transparent;
	border-left-color: transparent;
}

.canvas {
	position: relative;
	height: 100%;
	float: left;
	margin-right: 10px;
	background-color: blue;
}

.canvas .draw-area {
	position: absolute;
	top:0; right: 0; bottom: 0; left: 0;
	background: repeat url(img/transparent_background.png);
}

.canvas .pusher {
	height: 100%;
	float: left;
	background-color: red;
}

.previewlist {
	float: left;
	background-color: red;
	height: 100%;
	overflow-y: scroll;
}

.preview-item {
	position: relative;
	border: gray 1px solid;
	width: 200px;
	height: 200px;
	background-color: violet;
}

.preview-item-overlay {
	z-index: 10;
	position: absolute;
	background-color: rgba(0, 0, 0, 0.3);
	font-size: 14px;
	color: white;
	padding: 5px 8px;
	cursor: pointer;
	font-weight: bold;
	display: none;
}


.preview-item:hover .preview-item-overlay,
.preview-item-overlay:hover {
	display: block;
	opacity: 1.0;
}

.preview-item-overlay.tile-count {
	display: block;
	opacity: 0.5;
	border-bottom-right-radius: 3px;
	top: 0;
	left: 0;
}

.preview-item-overlay.tile-close {
	border-bottom-left-radius: 3px;
	top: 0;
	right: 0;
}

.preview-item img {
	width: 100%;
}

.animpreview {
	overflow: hidden;
	text-align: center;
	display: table;
	height: 100%;
}

.animpreview .animpreview-inner {
	display: table-cell;
	vertical-align: middle;
}

.animpreview img {
	width: 50%;
	box-shadow: 0 0 5px 5px #000;
}