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HTML

            
              .cube
	- 6.times do
		.cube__face
!

CSS

            
              $edge-len-landscape: 20vw;
$edge-len-portrait: 
	$edge-len-landscape*1vh/1vw;
$url: $base + 'cat_pumpkin_1.jpg';
$img-size: 374px;
$ratio: $edge-len-landscape/100vw;
$mq-val: $img-size/$ratio;

body {
	height: 100vh;
	perspective: 40em;
	background: silver;
}

div { position: absolute; }

.cube {
	top: 50%; left: 50%;
	transform-style: preserve-3d;
	animation: rot 8s linear infinite;
	
	&__face {
		width: $edge-len-landscape;
		height: $edge-len-landscape;
		min-width: $edge-len-portrait;
		min-height: $edge-len-portrait;
		
		@for $i from 0 to 6 {
			&:nth-child(#{$i + 1}) {
				transform: translate(-50%, -50%) 
					if($i < 4, rotateY($i*90deg), 
						rotateZ(pow(-1, $i)*90deg))
					translateX(50%) rotateY(90deg);
			}
		}
		
		/* set a background so we can see it */
		box-shadow: inset 0 0 0 1px #fff;
		opacity: .5;
		background: url($url) 50% no-repeat #000;

		@media (max-width: $mq-val), 
					(max-height: $mq-val) {
			background-size: contain;
		}
	}
}

@keyframes rot {
	to {
		transform: rotateY(1turn) rotate(1turn);
	}
}
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JS
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