body {
      font-family: Arial, sans-serif;
      margin: 0;
      padding: 20px;
      background-color: #f5f5f5;
    }

    h1 {
      text-align: center;
      margin-bottom: 20px;
    }

    .container {
      display: flex;
      flex-direction: row;
      gap: 20px;
      max-width: 1200px;
      margin: 0 auto;
      flex-wrap: wrap;
    }

    textarea, #preview {
      flex: 1 1 45%;
      min-width: 300px;
      height: 500px;
      padding: 15px;
      font-size: 16px;
      border-radius: 6px;
      box-sizing: border-box;
      background: white;
    }

    textarea {
      border: 1px solid #ccc;
      resize: vertical;
    }

    #preview {
      border: 1px solid #ddd;
      box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
      overflow: auto;
    }

    pre {
      background: #eee;
      padding: 10px;
      border-radius: 4px;
      overflow-x: auto;
    }

    code {
      font-family: monospace;
    }

    footer {
      text-align: center;
      margin-top: 40px;
      color: #555;
    }

    footer a {
      color: #007acc;
      text-decoration: none;
    }

    #github-avatar {
      vertical-align: middle;
      display: inline-flex;
      align-items: center;
    }

    @media (max-width: 768px) {
      .container {
        flex-direction: column;
      }
    }