<div>Hey, focus! You’re supposed to be looking at my corners, not reading my text. The text is just placeholder!</div>
body {
  padding: 1%;
}
/**
 * Beveled corners — with gradients
 */

div {
  background: #58a;
	background: linear-gradient(135deg, transparent 15px, #58a 0) top left,
	            linear-gradient(-135deg, transparent 15px, #58a 0) top right,
	            linear-gradient(-45deg, transparent 15px, #58a 0) bottom right,
	            linear-gradient(45deg, transparent 15px, #58a 0) bottom left;
	background-size: 50% 50%;
	background-repeat: no-repeat;
	
	padding: 1em 1.2em;
	max-width: 12em;
	color: white;
	font: 150%/1.6 Baskerville, Palatino, serif;
}

External CSS

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