novnc/include/black.css

#noVNC-control-bar {
	background-color:#000;
	background-image: -webkit-gradient(
		linear,
		left bottom,
		left top,
		color-stop(0.5, rgb(0,0,0)),
		color-stop(0.5, rgb(20,20,20))
	);
	background-image: -moz-linear-gradient(
		center bottom,
		rgb(0,0,0) 50%,
		rgb(20,20,20) 50%
	);
}

.triangle-right {
		border:2px solid #fff;
		background:#000;
		color:#fff;
}