body {
    margin: 0;
    padding: 0;
    background: #111;
    color: #fff;
    font-family: Arial, sans-serif;
  }
  
  .gallery {
    column-count: 3;
    column-gap: 0;
    max-width: 1200px;
    margin: 0 auto;
  }
  
  .gallery a {
    display: inline-block;
    width: 100%;
  }
  
  .gallery img {
    width: 100%;
    display: block;
  }
  
  /* Mobile: single column */
  @media (max-width: 768px) {
    .gallery {
      column-count: 1;
    }
  }