body {
	font-family: sans-serif;
	--piece-size: 40px;
	--image: url("https://upload.wikimedia.org/wikipedia/commons/0/09/Croatia_Opatija_Maiden_with_the_Seagull_BW_2014-10-10_10-35-13.jpg");
	--view-width: 800px;
	--view-height: 480px;
}

#play-area {
	width: 100vw;
	height: 100vh;
	position: relative;
}

.piece {
	position: absolute;
	width: var(--piece-size);
	height: var(--piece-size);
	background-image: var(--image);
	background-size: var(--view-width) var(--view-height);
	clip-path: path("M0 0 L40 0 L30 40 L0 40 Z");
}