.grid {
    position: absolute;
    top:0px;
    left:0px;
    width: 100%;
    height: 100%;
    z-index: 0;
  }
  
  .fond {
    position: relative;
    overflow: hidden;
    background: #111;
    width: 100%;
    height: 100%;
  }
  .fond img {
    position: absolute; top: 50%; left: 50%; 
    width: auto;
    height: 100%;
    transform: translate(-50%, -50%);
    transition: opacity 1s ease; opacity: 1;
    max-width: none; max-height: none;
  }
  .progress-container {
    position: absolute;
    bottom:8px;
    right:8px;
    width: 200px;
    height: 4px;
    background: rgba(255,255,255,0.3);
    overflow: hidden; border-radius: 2px;
    z-index: 10;
  }
  .progress-bar {
    width: 0%; height: 100%;
    background: red;
  }