All .ipynb page lengths are infinitely extended

<!-- Thank you for reporting an issue. Please make sure that your style is up to date and you checked the recent commits to ensure that your issue wasn't recently addressed. If the page is not publicly accessible, include the HTML code around the issue. --> * **Browser**: Chrome * **Operating System**: Windows 11 * **Link to page with the issue**: https://github.com/GoogleCloudPlatform/generative-ai/blob/main/gemini/getting-started/intro_gemini_2_0_flash_thinking_mode.ipynb All ipynb pages have this problem. ### Please pay attention to the scrollbar on the right. * **Screenshot**:  After closing GitHub-Dark, we can touch the bottom: