body {
      margin: 0;
      padding: 0;
      background: #000;
    }

    .preloader {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      display: flex;
      justify-content: center;
      align-items: center;
    }

    .preloader span {
      display: block;
      height: 15px;
      width: 15px;
      background: #19e3d5;
      margin: 0 7px;
      border-radius: 10px;
      animation: 1.2s upDown infinite;
    }

    .preloader span:first-child {
      animation-delay: .15s;
    }

    .preloader span:nth-child(2) {
      animation-delay: .3s;
    }

    .preloader span:nth-child(3) {
      animation-delay: .45s;
    }

    .preloader span:nth-child(4) {
      animation-delay: .6s;
    }

    .preloader span:last-child {
      animation-delay: .75s;
    }

    @keyframes upDown {
      0% {
        height: 15px;
        background: #19e3d5;
      }

      50% {
        height: 60px;
        background: #d33deb;
      }

      100% {
        height: 15px;
        background: #f00e43;
      }
    }