body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
  }
  
  header {
    text-align: center;
    background-color: green;
    color: white;
    padding: 1rem 0;
  }
  
  main {
    padding: 1rem;
  }
  
  .gallery {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
  }
  
  .video-item {
    flex: 1 1 calc(33.333% - 1rem);
    max-width: calc(33.333% - 1rem);
  }
  
  .gallery-item {
    flex: 1 1 calc(33.333% - 1rem);
    max-width: calc(33.333% - 1rem);
  }
  
  .gallery-item img {
    width: 100%;
    height: auto;
    display: block;
    cursor: pointer;
    border-radius: 8px;
  }
  
  @media (max-width: 768px) {
    .gallery-item {
      flex: 1 1 calc(50% - 1rem);
      max-width: calc(50% - 1rem);
    }
  }
  
  @media (max-width: 480px) {
    .gallery-item {
      flex: 1 1 100%;
      max-width: 100%;
    }
  }
  
  /* Modal styles */
  .modal {
    display: none;
    position: fixed;
    z-index: 1000;
    padding-top: 60px;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgb(0, 0, 0);
    background-color: rgba(0, 0, 0, 0.9);
  }
  
  .modal-content {
    margin: auto;
    display: block;
    width: 80%;
    max-width: 700px;
  }
  
  .close {
    position: absolute;
    top: 20px;
    right: 35px;
    color: #fff;
    font-size: 40px;
    font-weight: bold;
    cursor: pointer;
  }
  
  .close:hover,
  .close:focus {
    color: #bbb;
    text-decoration: none;
    cursor: pointer;
  }