Color-Cube/style.css

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: 0.5s;
}
body{
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: #050505;
}
.cube{
    position: relative;
    width: 300px;
    height: 300px;
    transform-style: preserve-3d;
    animation: animate 4s linear infinite;
}
@keyframes animate{
    from{transform: rotateX(-30deg) rotateY(0deg);}
    to{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%;
    background: linear-gradient(#151515, #00ec00);
    transform: rotateY(calc(90deg * var(--i))) translateZ(150px);
}
.top{
    position: absolute;
    top: 0;
    left: 0;
    width: 300px;
    height: 300px;
    background: #222;
    transform: rotateX(90deg) translateZ(150px);
    transition: 0.5s;
}
.after{
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 300px;
    height: 300px;
    background: var(--color,#00ec00);
    transform: rotateX(90deg) translateZ(-150px);
}
.before{
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 300px;
    height: 300px;
    background: var(--color,#0f0);
    transform: rotateX(90deg) translateZ(-230px);
    filter: blur(20px);
    box-shadow: 0 0 120px rgba(0,255,0,0.2),
    0 0 200px rgba(0,255,0,0.4),
    0 0 300px rgba(0,255,0,0.6),
    0 0 400px rgba(0,255,0,0.8);
    transition: 0.5s;
}
.colors{
    position: absolute;
    top: 0;
    padding: 0px 15px 5px 15px;
    background: #444;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: row;
    filter: drop-shadow(0 0 20px #888);
    border-radius: 0 0 50px 50px;
}
.colors span{
    position: relative;
    width: 20px;
    height: 20px;
    background: var(--clr);
    margin: 10px;
    border-radius: 50%;
    cursor: pointer;
    transition: 0.5s;
}
.colors span:hover{
    filter: brightness(0.5);
    scale: 1.25;
    transition: 0.5s;
}
.colors span.active{
    filter: drop-shadow(2px 2px 4px #888);
    scale: 1.5;
    transition: 0.5s;
}