cubeanim.css

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body{
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: black;
}

.container{
    display: flex;
    justify-content: space-between;
}

.cube{
    position: relative;
    width: 200px;
    height: 200px;
    transform-style: preserve-3d;
    transform: rotateX(-30deg);
    animation: animate 4s linear infinite;
}

@keyframes animate{
    0%{
        transform: rotateX(-30deg) rotateY(0deg);
    }
    100%{
        transform: rotateX(-30deg) rotateY(360deg);
    }
}

.cube div{
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    transform-style: preserve-3d;
}

.cube div span{
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    /* border: 2px solid black; */
    background: linear-gradient(#f9f002, #aa00ff);
    transform:rotateY(calc(90deg*var(--i))) translateZ(100px);
}

.top{
    position: absolute;
    top: 0;
    left: 0;
    width: 200px;
    height: 200px;
    background: #f6f212;
    /* border: 2px solid black; */
    transform: rotateX(90deg) translateZ(100px);
}

.top::before{
    content:'';
    position: absolute;
    top: 0;
    left: 0;
    width: 200px;
    height: 200px;
    background: yellow;
    transform: translateZ(-280px);
    filter: blur(20px);
    box-shadow: 0 0 120px rgba(251, 255, 0, 0.219),
     0 0 200px rgba(255, 251, 0, 0.4),
     0 0 200px rgba(183, 0, 255, 0.6),
     0 0 200px rgba(157, 0, 255, 0.8),
     0 0 200px rgb(170, 0, 255);

}