* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, sans-serif;
  }
  
  header {
    text-align: center;
    background-color: #4a90e2;
    color: white;
    padding-bottom: 10px;
  }
  
  .banner {
    width: 100%;
    height: 200px;
    object-fit: cover;
  }
  
  nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    background-color: #357ABD;
    padding: 10px;
  }
  
  nav ul li {
    margin: 0 15px;
  }
  
  nav ul li a {
    color: white;
    text-decoration: none;
    font-weight: bold;
  }
  
  nav ul li a:hover {
    text-decoration: underline;
  }
  
  .borrow-section {
    width: 80%;
    margin: 30px auto;
    background-color: #f9f9f9;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
  }
  
  form {
    display: flex;
    flex-direction: column;
    gap: 10px;
  }
  
  form input, form button {
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
  }
  
  form button {
    background-color: #4a90e2;
    color: white;
    cursor: pointer;
    transition: 0.3s;
  }
  
  form button:hover {
    background-color: #357ABD;
  }
  
  /* Danh sách sách */
  .recent-books {
    width: 90%;
    margin: 30px auto;
    text-align: center;
  }
  
  .book-slider {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  
  .book-grid {
    display: flex;
    gap: 20px;
    overflow-x: auto;
    scroll-behavior: smooth;
    padding: 10px;
  }
  
  .book-item {
    flex: 0 0 200px;
    background-color: white;
    border: 1px solid #ddd;
    border-radius: 10px;
    padding: 10px;
    text-align: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
  }
  
  .book-item img {
    width: 100%;
    height: 260px;
    object-fit: cover;
    border-radius: 8px;
  }
  
  .book-item button {
    background-color: #4a90e2;
    color: white;
    border: none;
    border-radius: 5px;
    padding: 8px;
    margin-top: 8px;
    cursor: pointer;
  }
  
  .book-item button:hover {
    background-color: #357ABD;
  }
  
  /* Nút trượt */
  .slide-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background-color: rgba(0,0,0,0.5);
    color: white;
    border: none;
    border-radius: 50%;
    width: 45px;
    height: 45px;
    cursor: pointer;
    z-index: 10;
    font-size: 20px;
    transition: 0.3s;
  }
  
  .slide-btn:hover {
    background-color: rgba(0,0,0,0.8);
  }
  
  .slide-btn.left {
    left: 10px;
  }
  
  .slide-btn.right {
    right: 10px;
  }
  
  footer {
    background-color: #4a90e2;
    color: white;
    text-align: center;
    padding: 15px;
    margin-top: 30px;
  }