.cube{
  --size: 150px;
  --cubeColor: #d4d4d4;
  --scubeColor: #3a3a3a;
  position: relative;
  width: var(--size);
  height: var(--size);
  margin-top: auto;
  margin-bottom: auto;
  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%;
  background: linear-gradient( var(--cubeColor),var(--scubeColor));
  transform: rotateY(calc(90deg * var(--i))) translateZ(calc(var(--size) / 2));
}

.top{
  position: absolute;
  top: 0;left: 0;
  background: var(--cubeColor);
  width: var(--size);
  height: var(--size);
  transform: rotateX(90deg) translateZ(calc(var(--size) / 2));
}

.top::before{
  content: '';
  position: absolute;
  top: 0;left: 0;
  width: var(--size);
  height: var(--size);
  transform: translateZ(calc(var(--size) * -1.5));
  filter: blur(130px);
  background: var(--cubeColor);
  box-shadow: 0 0 120px var(--cubeColor); /
}

.skin-selector {
  display: flex;
  gap: 15px;
  margin-top: 1.5rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
  justify-content: center;
  max-width: 90%;
  z-index: 10;
}

.skin-btn {
  width: 25px;
  height: 25px;
  border-radius: 50%;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all 0.2s ease;
  opacity: 0.8;
}

.skin-btn.selected {
  transform: scale(1.4);
  opacity: 1;
  border-color: var(--colorTx);
  box-shadow: 0 0 10px currentColor; 
}

@media screen and (min-width: 430px){
    .cube{
        --size: 165px;
    }
}

@media screen and (min-width: 530px){
    .cube{
        --size: 175px;
    }
}

@media screen and (min-width: 630px){
    .cube{
        --size: 200px;
    }
}

@media screen and (min-width: 830px){
    .cube{
        --size: 225px;
    }  
}