.scroll-down-icon {
  height: 50px;
  width: 30px;
  border: 2px solid #fff;
  border-radius: 15px;
  transition: opacity 0.4s;
  position: fixed;
  bottom: 50px;
  left: 50%;
  margin-left: -15px;

  &--hidden {
    opacity: 0;
  }

  &:after {
    content: '';
    position: absolute;
    width: 4px;
    background: #fff;
    border-radius: 2px;
    height: 8px;
    top: 10px;
    left: 11px;
    animation: scroll-down-animation-wheel 1s infinite;
  }

  @keyframes scroll-down-animation-wheel {
    0% {
      transform: translateY(0);
      opacity: 1;
    }
    80% {
      transform: translateY(5px);
      opacity: 0;
    }
    100% {
      transform: translateY(0);
      opacity: 0;
    }
  }
}