fix(demo): amazon review responsive style

[emiliosheinz]

This PR fixes two issues in the Amazon review demo:

• Font-family typo: Corrects a small typo by changing seri to serif to ensure proper fallback font rendering.
• Responsive layout: Adjusts the styling so that columns stack vertically on smaller screens, improving readability and mobile responsiveness.

Before

Screen.Recording.2025-07-27.at.12.10.15.mov

After

Screen.Recording.2025-07-27.at.12.10.39.mov

Closes #2386

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