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HTML 

              
                <div class="container">
	<div class="scene">
		<div class="webpack-cube">
			<div class="outer-cube">
				<div class="face face-top"></div>
				<div class="face face-bottom"></div>
				<div class="face face-left"></div>
				<div class="face face-right"></div>
				<div class="face face-front"></div>
				<div class="face face-back"></div>
			</div>
			<div class="inner-cube">
				<div class="face face-top"></div>
				<div class="face face-bottom"></div>
				<div class="face face-left"></div>
				<div class="face face-right"></div>
				<div class="face face-front"></div>
				<div class="face face-back"></div>
			</div>
		</div>
		<div class="shadows-outer-container">
			<div class="shadow-outer"></div>
			</div>
		<div class="shadows-inner-container">
			<div class="shadow-inner"></div>
		</div>
	</div>
</div>
!

CSS 

              
                //vars
$animationDuration : 5.2s;
$cubeSize: 120px;
$outerCubeColor: rgba(141, 214, 249, 0.5);
$innerCubeColor: #1D78C1;
$innerCubeSize : $cubeSize;


body{
	-webkit-font-smoothing: antialiased;
	background: #2B3A42;
}

*{
	box-sizing: border-box;
}

@keyframes flipY {
    0% { transform:  translateX(-50%) scale3d(1,1,1) rotatex(0deg) rotatey(0deg) rotatez(0deg); }
	20.25%{ transform: translateX(-50%) scale3d(1,1,1) rotatex(0deg) rotatey(90deg) rotatez(0deg); }
	100% { transform: translateX(-50%) scale3d(1,1,1) rotatex(0deg) rotatey(90deg) rotatez(0deg); }
}
@keyframes flipY-innerCube {
    0% { transform: translateX(-50%) scale3d(0.5,0.5,0.5) rotatex(0deg) rotatey(0deg) rotatez(0deg); }
	20.25%{ transform: translateX(-50%) scale3d(0.5,0.5,0.5) rotatex(0deg) rotatey(-90deg) rotatez(0deg); }
	100% { transform: translateX(-50%) scale3d(0.5,0.5,0.5) rotatex(0deg) rotatey(-90deg) rotatez(0deg); }
}
@keyframes flipY-innerShadow {
    0% { transform: translatex(-50%) rotatex(-90deg) translatez(-20px) rotatez(0deg) }
	20.25%{ transform: translatex(-50%) rotatex(-90deg) translatez(-20px) rotatez(-90deg) }
	100% { transform: translatex(-50%) rotatex(-90deg) translatez(-20px) rotatez(-90deg) }
}

@keyframes flipY-outterShadow {
    0% { transform: translatex(-50%) rotatex(-90deg) translatez(105px) rotatez(0deg) }
	20.25%{ transform: translatex(-50%) rotatex(-90deg) translatez(105px) rotatez(90deg) }
	100% { transform: translatex(-50%) rotatex(-90deg) translatez(105px) rotatez(90deg) }
}

@keyframes border-front {
    0% { border-width: 1px 6px 6px 1px }
	 2.25% { border-width: 1px 6px 6px 1px }
	5.75%{ border-width: 1px 1px 1px 1px}
	100% { border-width: 1px 1px 1px 1px}
}
@keyframes border-back {
    0% { border-width: 1px 1px 1px 1px }
	2.25% { border-width: 1px 1px 1px 1px }
	5.75%{ border-width: 1px 1px 6px 6px }
	100% { border-width: 1px 1px 6px 6px}
}
@keyframes border-top {
    0% { border-width: 6px 6px 1px 1px }
	2.25% { border-width: 6px 6px 1px 1px }
	5.75%{ border-width: 1px 6px 6px 1px}
	100% { border-width:  1px 6px 6px 1px}
}
@keyframes border-left {
    0% { border-width: 1px 1px 6px 6px }
	2.25% { border-width: 1px 1px 6px 6px }
	5.75%{ border-width: 1px 6px 6px 1px}
	100% { border-width: 1px 6px 6px 1px}
}

@keyframes hoverY {
    0% {transform: translatey(0px) }
	100% { transform: translatey(-30px)}
}
@keyframes scaleBigShadow {
    0% { 
			transform: scale3d(0.65, 0.65, 0.65) }
	100% { 
		transform: scale3d(0.60, 0.60, 0.60) }
}
@keyframes scaleSmallShadow{
	0%{
		transform: scale3d(0.45, 0.45, 0.45);
	}
	100%{
		transform: scale3d(0.37, 0.37, 0.37);
	}
}
.container{
	display: flex;
	align-items: center;
	justify-content: center;
}
.scene{
	position: relative;
	//margin: 50px auto;
	width: 120px;
	height:120px;
	margin-top: 120px;
	transform-style: preserve-3d;
	transform: translateX(40px) rotatex(-33.5deg) rotatey(45deg);

	$hoverDuration: 2s;
	.webpack-cube{
		transform-style: preserve-3d;
		animation: hoverY $hoverDuration infinite alternate;
		animation-timing-function: ease-in-out;
	}

	.outer-cube{
		position: absolute;
		width: $cubeSize;
		height: $cubeSize;
		left: 0;
		top: 0;
		transform-style: preserve-3d;
		animation: 
			flipY $animationDuration infinite;
		display: inline-block;

		.face{
			position: absolute;
			width: 100%;
			height: 100%;
			text-align: center;
			background: $outerCubeColor;
			line-height: 100px;
			border: 1px solid white;

			&-front{
				transform: translatez($cubeSize/2);
				border-right-width: 6px;
				border-bottom-width: 6px;
				animation: border-front $animationDuration infinite;
				// animation-fill-mode: forwards;
			}
			&-back{
				transform: rotateY(180deg) translatez($cubeSize/2);
				animation: border-back $animationDuration infinite;
				// animation-fill-mode: forwards;
			}
			&-top{
				transform: rotatex(90deg) translatez($cubeSize/2);
				border-top-width: 6px;
				border-right-width: 6px;
				animation: border-top $animationDuration infinite;
				// animation-fill-mode: forwards;
			}
			&-bottom{
				//stays always at the bottom, doesnt need border transforms
				transform: rotatex(-90deg) translatez($cubeSize/2); 
			}
			&-left{
				transform: rotateY(-90deg) translatez($cubeSize/2);
				border-left-width: 6px;
				border-bottom-width: 6px;
				animation: border-left $animationDuration infinite;
				// animation-fill-mode: forwards;
			}
			&-right{
				//stays always at the back, doesnt need border transforms
				transform: rotateY(90deg) translatez($cubeSize/2);
			}
		}
	}

	
	.inner-cube{
		display: inline-block;
		position: absolute;
		width: $innerCubeSize;
		height: $innerCubeSize;
		left: 0;
		top: -2px;
		transform-style: preserve-3d;
		animation: flipY-innerCube $animationDuration infinite;


		.face{
			position: absolute;
			width: 100%;
			height: 100%;
			text-align: center;
			background: $innerCubeColor;
			line-height: 100px;
			border: 2px solid white;

			&-front{
				transform: translatez($innerCubeSize/2);
			}
			&-back{
				transform: rotateY(180deg) translatez($innerCubeSize/2);
			}
			&-top{
				transform: rotatex(90deg) translatez($innerCubeSize/2);
			}
			&-bottom{
				transform: rotatex(-90deg) translatez($innerCubeSize/2); 
			}
			&-left{
				transform: rotateY(-90deg) translatez($innerCubeSize/2);
			}
			&-right{
				transform: rotateY(90deg) translatez($innerCubeSize/2);
			}
		}
	}
	.shadows-outer-container{
		display: inline-block;
		transform-style: preserve-3d;
		width: $innerCubeSize;
		height: $innerCubeSize;
		transform: translatex(-50%) rotatex(-90deg) translatez(110px);
		animation: flipY-outterShadow $animationDuration infinite;
		
		.shadow-outer{
			display: inline-block;
			position: absolute;
			width: $innerCubeSize;
			height: $innerCubeSize;
			background-color: rgba(255, 255, 255, 0.5);
			animation: scaleBigShadow 2s infinite alternate;
			animation-timing-function: ease-in-out;
			box-shadow: 0px 0px 45px 35px rgba(255, 255, 255, 0.5);
			transform-origin: center center;
			transform: scale3d(0.8, 0.8, 0.8);
		}
	}
	.shadows-inner-container{
		display: inline-block;
		transform-style: preserve-3d;
		width: $innerCubeSize;
		height: $innerCubeSize;
		transform: translatex(-50%) rotatex(-90deg) translatez(0px) rotatez(0deg);
		animation: flipY-innerShadow $animationDuration infinite;
		
		.shadow-inner{
			display: inline-block;
			position: absolute;
			width: $innerCubeSize;
			height: $innerCubeSize;
			border-radius: 15px;
			background:  
				linear-gradient(0deg, rgba(0,0,0,0) 10%, rgba(109,109,109,0.7) 50%, rgba(0,0,0,0)),
				linear-gradient(90deg, rgba(0,0,0,0) 10%, rgba(109,109,109,0.7) 50%, rgba(0,0,0,0)),
				linear-gradient(180deg, rgba(0,0,0,0) 10%, rgba(109,109,109,0.7) 50%, rgba(0,0,0,0)),
				linear-gradient(270deg, rgba(0,0,0,0) 10%, rgba(109,109,109,0.7) 50%, rgba(0,0,0,0));
			animation: scaleSmallShadow 2s infinite alternate;
			animation-timing-function: ease-in-out;
			transform-origin: center center;
			transform:  scale3d(0.4, 0.4, 0.4);
		}
	}
}
!

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