(hydrogen): update font size on card, other visual improvements

[ehowey]

• fixes font size on the cards used on the homepage
• A few other very small visual improvements to the cards, e.g. box-shadow

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 28450183c1732c9f21c5ef7f26e6e5e578f09671

The changes in this PR will be included in the next version bump.

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