Untitled

dabblet.css

.area {
	background: crimson;
	
	width: 200px;
	height: 200px;
	position: relative;
}

.a {
	position: absolute;
	top: 10px;
	left: 10px;
	width: 100px;
	height: 100px;
	background: white;
	z-index: 10;
	opacity: 0.9;
}

.b {
	position: absolute;
	top: 20px;
	left: 20px;
	width: 20px;
	height: 20px;
	background: gray;
	z-index: 5;
	opacity: 0.5;
}

dabblet.html

<div class="area">

	<div class="a"></div>
	<div class="b"></div>

</div>

settings.json

{"view":"split","fontsize":"100","seethrough":"","prefixfree":"1","page":"css"}