/**
 * Esquina doblada
 */

div {
	width: 300px;
	background: #58a;
	background:
		linear-gradient(to left bottom, transparent 50%, rgba(0,0,0,.4) 0) 100% 0 no-repeat,
		linear-gradient(-135deg, transparent 23px, #58a 0);
	background-size: 32px 32px, auto;

	padding: 32px;
	color: white;
	font: 100%/1.6 Baskerville, Palatino, serif;
}