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CSS

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CSS Base

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <div class="wrapper">
	 <div class="wrapper__content">
			<div class="cube">
				 <div class="cube__side cube__side--front"></div>
				 <div class="cube__side cube__side--back"></div>
				 <div class="cube__side cube__side--left"></div>
				 <div class="cube__side cube__side--right"></div>
				 <div class="cube__side cube__side--top"></div>
				 <div class="cube__side cube__side--bottom"></div>
			</div>

			<div class="shadow">
				 <div class="cube">
						<div class="cube__side cube__side--front"></div>
						<div class="cube__side cube__side--back"></div>
						<div class="cube__side cube__side--left"></div>
						<div class="cube__side cube__side--right"></div>
						<div class="cube__side cube__side--top"></div>
						<div class="cube__side cube__side--bottom"></div>
				 </div>
			</div>
	 </div>
</div>
!

CSS 

              
                @use postcss-nested;
@use postcss-simple-vars;

body {
    margin: 0;
    padding: 0;  
}
.wrapper {
    display: flex;
    width: 100vw;
    height: 100vh;
    margin: 0;
    padding: 0;
    align-items: center;
    justify-content: center;
    background: #000000;

    &__content {
        height: 450px;
        width: 280px;
        position: relative;
    }
}

@keyframes rotation {
    0% {
        transform: rotateZ(0deg) rotateX(-15deg) rotateY(0deg)
    }
    100% {
        transform: rotateZ(0deg) rotateX(-15deg) rotateY(-360deg)
    }
}

@keyframes color-front {
    0%, 100%  {
       opacity: 1;
    }
    25%, 75% {
        opacity: 0;
    }
}
@keyframes color-back {
    0%, 100%, 25%, 75%  {
       opacity: 0;
    }
    50% {
        opacity: 1;
    }
}

@keyframes color-right {
    0%, 50%  {
       opacity: 0.25;
    }
    50%  {
        opacity: 0;
    }
    25% {
        opacity: 1;
    }
}

@keyframes color-left {
    0%, 50%, 100%  {
       opacity: 0;
    }
    75% {
        opacity: 1;
    }
}

.cube {
    --z-angle: 100px;
    --color: #06FFFF;
    --time: 5s;
   
    width: 203px;
    height: 203px;
    position: relative;
    transform-style: preserve-3d;
    transform-origin: center center; 
    transform: rotateZ(0deg) rotateX(0deg) rotateY(0deg);
    animation: rotation var(--time) infinite linear;

    &__side {
        position: absolute;
        width: 203px;
        height: 203px;
        opacity: 0;

        &:after{
            content: '';
            left: 0;
            top: 0; 
            width: 3px;
            height: 3px;
            background: var(--color);
            position: absolute;
            border-radius: 100%;
            box-shadow: 
                0px 40px 0px 0px var(--color), 
                0px 80px 0px 0px var(--color), 
                0px 120px 0px 0px var(--color), 
                0px 160px 0px 0px var(--color),
                0px 200px 0px 0px var(--color),

                40px 0px 0px 0px var(--color), 
                80px 0px 0px 0px var(--color), 
                120px 0px 0px 0px var(--color), 
                160px 0px 0px 0px var(--color), 
                200px 0px 0px 0px var(--color),

                40px 40px 0px 0px var(--color), 
                80px 40px 0px 0px var(--color), 
                120px 40px 0px 0px var(--color), 
                160px 40px 0px 0px var(--color), 
                200px 40px 0px 0px var(--color),

                40px 80px 0px 0px var(--color), 
                80px 80px 0px 0px var(--color), 
                120px 80px 0px 0px var(--color), 
                160px 80px 0px 0px var(--color), 
                200px 80px 0px 0px var(--color),

                40px 120px 0px 0px var(--color), 
                80px 120px 0px 0px var(--color), 
                120px 120px 0px 0px var(--color), 
                160px 120px 0px 0px var(--color), 
                200px 120px 0px 0px var(--color),

                40px 160px 0px 0px var(--color), 
                80px 160px 0px 0px var(--color), 
                120px 160px 0px 0px var(--color), 
                160px 160px 0px 0px var(--color), 
                200px 160px 0px 0px var(--color),

                40px 200px 0px 0px var(--color), 
                80px 200px 0px 0px var(--color), 
                120px 200px 0px 0px var(--color), 
                160px 200px 0px 0px var(--color), 
                200px 200px 0px 0px var(--color);
        }

        &--front {
            animation: color-front var(--time) infinite linear;
            transform: rotateY(0deg) translateZ(var(--z-angle)); 
        }
        &--right {
            transform: rotateY(90deg) translateZ(var(--z-angle)); 
            animation: color-right var(--time) infinite linear;
        }
        &--back {
            transform: rotateY(180deg)  translateZ(var(--z-angle)); 
            animation: color-back var(--time) infinite linear;
        }
        &--left {
            transform: rotateY(-90deg)  translateZ(var(--z-angle)); 
            animation: color-left var(--time) infinite linear;
        }
        &--top {
            opacity: 1;
            transform: rotateX(90deg) translateZ(var(--z-angle)); 
        }
        &--bottom {
            opacity: 0;
        }
    }
}
.shadow {
    position: absolute;
    top: 258px;
    filter: blur(1px);

    .cube {
        &__side:not(.cube__side--top) {
            mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.9) , rgba(0, 0, 0, 0) 80%);
            -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.9) , rgba(0, 0, 0, 0) 80%);
        }
    }
}
!

JS 

              
                /*Chrome only demo*/
!
999px

Console