/* relevant for the tutorial - start */

  #gallery { position: relative; }

    #pictures { position: relative; height: 408px; }

    #pictures img { position: absolute; top: 0; left: 0; }

    

    #prev, #next { margin-top: 30px; text-align: center; font-size: 2.0em; }

  /* relevant for the tutorial - end */