Improve blocks responsiveness

[ghsteff]

PR Checklist

Please check if your PR fulfills the following requirements:

• [ ] Tests for the changes have been added (for bug fixes / features)
• [ ] Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[x] Other... Please describe: Styling improvements

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

This improves some of the big obvious issues with blocks on mobile screens

e.g. BEFORE

https://github.com/reaviz/reablocks/assets/40581813/69c930e4-b535-4e42-9ba3-98304a8d247a

AFTER

https://github.com/reaviz/reablocks/assets/40581813/647068ab-dd92-47dc-81df-b46be35f9f55

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