*{
    box-sizing: border-box;
    overflow: none;
}

.preloader{
    width: 100vw;
    height: 100vh;
    position: fixed;
    top: 0%;
    left: 0%;
    z-index: 10000;
    background-color: rgba(0, 0, 0,0.9);
    display: flex;
    align-items: center;
    justify-content: center;
}

@keyframes atom {
    from { transform: none; }
    to { transform: translateY(-10px); }
  }
  @keyframes electron-circle1 {
    from { transform: rotateY(70deg) rotateZ(20deg); }
    to { transform: rotateY(70deg) rotateZ(380deg); }
  }
  @keyframes electron1 {
    from { transform: rotateZ(-20deg) rotateY(-70deg); }
    to { transform: rotateZ(-380deg) rotateY(-70deg); }
  }
  @keyframes electron-circle2 {
    from { transform: rotateY(60deg) rotateX(60deg) rotateZ(-30deg); }
    to { transform: rotateY(60deg) rotateX(60deg) rotateZ(330deg); }
  }
  @keyframes electron2 {
    from { transform: rotateZ(30deg) rotateX(-60deg) rotateY(-60deg); }
    to { transform: rotateZ(-330deg) rotateX(-60deg) rotateY(-60deg); }
  }
  @keyframes electron-circle3 {
    from { transform: rotateY(-60deg) rotateX(60deg) rotateZ(100deg); }
    to { transform: rotateY(-60deg) rotateX(60deg) rotateZ(460deg); }
  }
  @keyframes electron3 {
    from { transform: rotateZ(-100deg) rotateX(-60deg) rotateY(60deg); }
    to { transform: rotateZ(-460deg) rotateX(-60deg) rotateY(60deg); }
  }
  
  
  .atom {
    
    margin: 50px auto;
    width: 120px;
    height: 120px;
    position: relative;
    animation: atom 1s ease-in-out infinite alternate;
    perspective: 300px;
    transform-style: preserve-3d;
  }
  .atom:before {
      content: '';
      position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    margin: auto;
    width: 20px;
    height: 20px;
    border-radius: 10px;
    background: #555;
  }
  .atom .electron {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    margin: auto;
      width: 100px;
    height: 100px;
    border-radius: 50px;
    border: 2px solid #666;
    transform-style: preserve-3d;
  }
  .atom .electron:before {
      content: '';
    position: absolute;
    top: -4px;
    left: 0;
    right: 0;
    margin: auto;
    width: 8px;
    height: 8px;
    border-radius: 4px;
    background: #666;
    transform-origin: 50% 50% 0;
  }
  .atom .electron:nth-child(1) {
    transform: rotateY(70deg) rotateZ(20deg);
    animation: electron-circle1 3s linear infinite;
  }
  .atom .electron:nth-child(2) {
    transform: rotateY(60deg) rotateX(60deg) rotateZ(-30deg);
    animation: electron-circle2 3s linear infinite;
  }
  .atom .electron:nth-child(3) {
    transform: rotateY(-60deg) rotateX(60deg) rotateZ(100deg);
    animation: electron-circle3 3s linear infinite;
  }
  .atom .electron:nth-child(1):before {
    transform: rotateZ(-20deg) rotateY(-70deg);
    animation: electron1 3s linear infinite;
  }
  .atom .electron:nth-child(2):before {
    transform: rotateZ(30deg) rotateX(-60deg) rotateY(-60deg);
    animation: electron2 3s linear infinite;
  }
  .atom .electron:nth-child(3):before {
    transform: rotateZ(-100deg) rotateX(-60deg) rotateY(60deg);
    animation: electron3 3s linear infinite;
  }