@keyframes move-it {
    0% {
      background-position: initial;
    }
    100% {
      background-position: 100px 0px;
    }
  }
  
  body {  
    background: repeating-linear-gradient(
    45deg,
    #999999,
    #999999 5%,
    #FFFFFF 5%,
    #FFFFFF 10%
  );
    background-size: 100px 100px;
    animation: move-it 2s linear infinite;
  }

  .logo {
    position: absolute;
    margin: 0 auto;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 1000;
  }