body_zz {
            font-family: 'Inter', sans-serif;
            background-color: #f0f4f8; /* Light blue-gray background */
            display: flex;
            justify-content: center;
            align-items: flex-start; /* Align to top for better content flow */
            min-height: 100vh;
            padding: 20px;
            box-sizing: border-box;
        }
        .container {
            background-color: #ffffff;
            border-radius: 12px; /* Rounded corners */
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1); /* Soft shadow */
            padding: 30px;
            max-width: 800px;
            width: 100%;
            margin-top: 30px; /* Space from top */
        }
        textarea {
            resize: vertical; /* Allow vertical resizing */
            min-height: 100px;
        }
        pre {
            background-color: #e2e8f0; /* Light gray background for code/tree */
            padding: 15px;
            border-radius: 8px;
            overflow-x: auto; /* Enable horizontal scrolling for long lines */
            white-space: pre-wrap; /* Wrap long lines */
            word-wrap: break-word; /* Break words if necessary */
        }