*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body{
    display: flex;
    justify-content: center;
    align-items: center;
    min-height:100vh;
    background: black;
}
.cube{
    /* border: 1px solid red; */
    /* position: absolute; */
    width: 300px;
    height: 300px;
    transform-style: preserve-3d;
    transform: rotateX(-30deg);
    animation: animate 6s linear infinite;
}
@keyframes animate{
    0%{
        transform: rotateX(-30deg) rotateY(0deg);
    }
    50%{
        transform: rotateX(-30deg) rotateY(-90deg);
    }
    100%{
        transform: rotateX(-30deg) rotateY(360deg);
    }
}
.cube div{
    position: absolute;
    top: 0;
    left: 0;
    /* border: 2px white solid; */
    width: 100%;
    height: 100%;
    transform-style: preserve-3d; 
}
.cube div span{
    position: absolute;
    top: 0;
    left: 0;
    /* border: 2px white solid; */
    width: 100%;
    height: 100%;
    background: linear-gradient(rgb(16, 16, 16),blue);
    transform: rotateY(calc(90deg * var(--i))) translateZ(150px);
}
.top{
    position: absolute;
    top: 0;
    left: 0;
    /* border: 2px white solid; */
    width: 100%;
    height: 100%;
    background:rgb(16, 16, 16);
    transform: rotateX(90deg ) translateZ(150px);
}
.top::before{
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    /* border: 2px white solid; */
    width: 100%;
    height: 100%;
    transform: translateZ(-380px);
    background: blue;
    filter: blur(20px);
    box-shadow: 0 0 120px rgba(0,0,255,0.2),
    0 0 200px,rgba(0,0,255,0.4),
    0 0 300px,rgba(0,0,255,0.6),
    0 0 400px,rgba(0,0,255,0.8),
    0 0 500px,rgba(0,0,255,1);
}