body {
    margin: 0;
    padding: 0;
  }
  
  .content {
    margin-top: 100px; /* added margin-top so content doesn't get covered */
  }
  
  .icon-grid {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    animation: diagonal-scroll 100s linear infinite;
    background-image: url(logo.svg);
    background-size: 5%;
    padding: 10px;
    box-sizing: border-box; /* include padding in box model */
    z-index: -1;
  }
  
  .icon-grid div {
    display: inline-block;
    width: 10%; /* each icon takes up 10% of width */
    height: 0;
    padding-bottom: 10%; /* each icon has a 10% padding-bottom */
  }
  
  @keyframes diagonal-scroll {
    0% {
      background-position: 0 0;
    }
    100% {
      background-position: 200% 200%;
    }
  }