html, body {
      margin: 0;
      padding: 0;
      background: #000;
      overflow: hidden;
      height: 100%;
      width: 100%;
    }
    #art-container {
      position: relative;
      width: 100%;
      height: 100%;
      overflow: hidden;
    }
    #fade-overlay {
      pointer-events: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: #000;
      opacity: 0;
      transition: opacity 2s ease;
    }
    .element {
      position: absolute;
      will-change: transform, opacity;
    }
body {
    background-image:url(assets/bg.gif); 
    background-repeat: repeat;
}