.loader-overlay {
    opacity: 0.8;
    background-color: #ffffff;
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0px;
    left: 0px;
  }

  .cube {
    -webkit-transform-style: preserve-3d;
    -webkit-animation: spin 3s infinite ease-out;
    position: relative;
    width: 100px;
    height: 100px;
    top: 50%;
    left: 50%;
    margin-left: -50px;
    margin-top: -50px;
  }

  .cube div {
    width: 100px;
    height: 100px;
    line-height: 100px;
    text-align: center;
    box-shadow: inset 0px 0px 0px 4px #21699e;
    background: #ffffff;
    display: block;
    position: absolute;
  }

  .cube div.top {
    -webkit-transform: rotateX(90deg);
    margin-top: -50px;
  }

  .cube div.right {
    -webkit-transform: rotateY(90deg);
    margin-left: 50px;
  }

  .cube div.bottom {
    -webkit-transform: rotateX(-90deg);
    margin-top: 50px;
  }

  .cube div.left {
    -webkit-transform: rotateY(-90deg);
    margin-left: -50px;
  }

  .cube div.front {
    -webkit-transform: translateZ(50px);
  }

  .cube div.back {
    -webkit-transform: translateZ(-50px) rotateX(180deg);
  }

  @-webkit-keyframes spin {
    0% {
      -webkit-transform: rotateX(-20deg) rotateY(20deg);
    }

    100% {
      -webkit-transform: rotateX(-20deg) rotateY(740deg);
    }
  }