/* relevant for the tutorial - start */
  #gallery { position: relative;}
    #pictures { position: relative; height: 316px; width:316px;background-color: #ffffff;}
    #pictures img { position: absolute; top: 0; left: 0;}
    
    #prev, #next { margin-top: 10px; margin-bottom: 10px; text-align: center; color: #121212;}
  /* relevant for the tutorial - end */