body {
            background: #f5f7fa;
            color: #333;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            margin: 0;
            padding: 2rem;
            display: flex;
            justify-content: center;
            align-items: flex-start;
            min-height: 100vh;
        }
        .container {
            background: #fff;
            max-width: 720px;
            padding: 2rem 3rem;
            border-radius: 12px;
            box-shadow: 0 6px 18px rgba(0,0,0,0.1);
            line-height: 1.6;
        }
        h1 {
            margin-top: 0;
            font-weight: 700;
            font-size: 1.8rem;
            text-align: center;
            color: #2c3e50;
            margin-bottom: 0.25rem;
            letter-spacing: 0.05em;
        }
        h2 {
            font-weight: 500;
            font-size: 1.1rem;
            text-align: center;
            margin-top: 0;
            margin-bottom: 1.5rem;
            color: #7f8c8d;
            font-style: italic;
        }
        pre {
          background: #272822;
          color: #f8f8f2;
          padding: 1.5rem;
          border-radius: 8px;
          overflow-x: auto;
          font-family: 'Source Code Pro', monospace;
          font-size: 1rem;
          white-space: pre-wrap;
          word-wrap: break-word;
          margin: 0;         /* remove extra margin */
          text-indent: 0;    /* remove any accidental indent */
        }

        footer {
            margin-top: 2rem;
            font-size: 0.85rem;
            text-align: center;
            color: #95a5a6;
            user-select: none;
        }
        @media (max-width: 480px) {
            .container {
                padding: 1.5rem 1.5rem;
            }
        }

        .license-text {
          white-space: pre-wrap;
          background: #272822;
          color: #f8f8f2;
          padding: 1.5rem;
          border-radius: 8px;
          font-family: 'Source Code Pro', monospace;
        }