Add CSS resets and specifiers to play nice with HF blog

[aliabid94]

footer img was inheriting margin, and h1 was inheriting color.

Fixes: #4963

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Name	Status	Preview	Updated (UTC)
gradio	✅ Ready (Inspect)	Visit Preview	Jul 22, 2023 0:14am

[gradio-pr-bot]

🦄 change detected

This Pull Request includes changes to the following packages.

Package	Version
@gradio/theme	patch
gradio	patch

• Maintainers can select this checkbox to manually select packages to update.

With the following changelog entry.

Add CSS resets and specifiers to play nice with HF blog

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[gradio-pr-bot]

All the demos for this PR have been deployed at https://huggingface.co/spaces/gradio-pr-deploys/pr-4997-all-demos

---

You can install the changes in this PR by running:

pip install https://gradio-builds.s3.amazonaws.com/ad62cd9238b39952abe4497682ef1c4af7503cc6/gradio-3.38.0-py3-none-any.whl

[pngwn]

Looks good! Thanks for handling this @aliabid94!

[gradio-pr-bot]

🎉 Chromatic build completed!

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There are 0 failed tests to fix.

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