.preloader {
    display: inline-block;
    position: fixed;
    background-color: #1E1E1E;
    z-index: 100;
    width: 100%;
    height: 100vh;
    display: flex;
    transition: 0.4s;
    opacity: 1;
    visibility: visible;
    align-items: center;
    justify-content: center;
    flex-direction: column;
  }
  .preloader:before {
    display: block;
    content: " ";
    width: 64px;
    height: 64px;
    margin: 0 auto;
    border-radius: 50%;
    border: 6px solid #fff;
    border-color: #fff transparent #fff transparent;
    animation: preloader 1.8s linear infinite;
  }
  @keyframes preloader {
    0% {
      transform: rotate(0deg);
    }
    100% {
      transform: rotate(360deg);
    }
  }