* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    text-align: center;
    font-family: Arial, sans-serif;
  }
  
  h1 {
    margin: 20px 0;
    font-size: 2rem;
  }
  
  #main_box {
    max-width: 90%;
    height: 80vh;
    margin: 20px auto;
    background: url('img/bg3.gif') no-repeat center center;
    background-size: cover;
    padding: 20px;
    border: 2px solid #ccc;
    border-radius: 12px;
    transition: background 0.3s ease;
  }
  
  .thumbnails {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
  }
  
  .mini_boxes {
    width: 150px;
    height: 150px;
    cursor: pointer;
    border: 2px solid #eee;
    border-radius: 10px;
    object-fit: cover;
    transition: transform 0.2s ease;
  }
  
  .mini_boxes:hover {
    transform: scale(1.05);
    border-color: #aaa;
  }