body {
        font-family: Arial, sans-serif;
        margin: 2rem;
        line-height: 1.6;
      }
      h2 {
        color: #2c3e50;
      }
      code {
        background-color: #f4f4f4;
        padding: 2px 4px;
        border-radius: 4px;
      }
      pre {
        background-color: #f9f9f9;
        padding: 1rem;
        border-left: 4px solid #3498db;
        overflow-x: auto;
      }
      table {
        width: 100%;
        border-collapse: collapse;
        margin-top: 2rem;
      }
      table,
      th,
      td {
        border: 1px solid #ccc;
      }
      th,
      td {
        padding: 0.75rem;
        text-align: left;
      }
      th {
        background-color: #ecf0f1;
      }

      .theory-box {
        background-color: #f5f5f5;
        padding: 15px;
        border-left: 4px solid #4CAF50;
        margin: 10px 0;
      }
      
      .example-box {
        background-color: #e3f2fd;
        padding: 10px;
        border-radius: 5px;
        margin: 10px 0;
      }

      .important-note {
        color: #d32f2f;
        font-weight: bold;
      }
      .back-button {
        display: inline-block;
        padding: 10px 20px;
        background-color: #3498db;
        color: white;
        text-decoration: none;
        border-radius: 5px;
        margin: 20px 0;
        transition: background-color 0.3s ease;
      }
      .back-button:hover {
        background-color: #2980b9;
      }