style.css

*
{
    margin: 0%;
    padding: 0%;
    box-sizing: border-box;
}
body{
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: rgba(0, 0, 0, 0.934);
}
.cube
{
    position: relative;
    width: 250px;
    height: 250px;
    transform-style: preserve-3d;
    animation: animate 4s linear infinite;
}
@keyframes animate {
    0% {
        transform: rotateX(30deg) rotateY(0deg);
       }
    100%{
        transform: rotateX(-360deg) rotateY(360deg);
        }
    }
.cube div{
    position: absolute;
    top: 0;
    left: 0;
    width: 70%;
    height: 70%;
    transform-style: preserve-3d;
}
.cube div span{
    position:absolute;
    top: 0;
    left: 0;
    width: 50%;
    height: 50%;
    background: linear-gradient(black,rgb(238, 42, 42));
    transform: rotateY(calc(90deg*var(--i))) translateZ(150px);
}
h1{
    font-size: xx-large;
    color: rgb(254, 254, 254);
    z-index: 9;
    justify-content: center; 
    align-items: center; 
    font-style:italic; 
}