The first commented line is your dabblet’s title

dabblet.css

/**
 * The first commented line is your dabblet’s title
 */

div{
	width: 200px;
	height: 200px; 
	background: red;
	margin: 80px;
	border-radius: 20px;
	position: relative;
	box-shadow: inset 2px 2px 15px black;
}
div:before{
	content: ' ';
	display:block;
	width: 0;
	border-left: red 30px solid;	
	border-right: transparent 30px solid;
	border-bottom: transparent 30px solid;
	border-top: transparent  30px solid;
	position:absolute;
	top: 60px; right: -60px;
}

dabblet.html

<div>

dabblet.js

// alert('Hello world!');

settings.json

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