Fix bug: education cards cut off on smaller screens, issue #576

[gitalink]

Fix bug where cards cut off on smaller screens

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Please include the issue number the pull request fixes by replacing YOUR-ISSUE-HERE in the text below.

Fixes #576

Summary

On smaller screens, the cards were cut off on the bottom. I have adjusted cards sizing for screens with a max width of 400 using Material UI theme.breakpoints.down(400). ## Details

I picked 400 as it includes phones 6/7/8, and does not include Iphones 6/7/8plus.

I also changed the Facts cards title style to match Quiz cards title, as on smaller screens the h4 font was too big compared to the body text size.

Test Plan (required)

I tested on Chrome console and my iPhone8.

Final Checklist

• [x ] For CoronaTracker, did you bump the version in package.json?
  • Update the second decimal for a major change
  • Update the third decimal for a minor change
  • Numbers can go past 9, e.g. 1.0.9 => 1.0.10
  • For more info, read about Semantic Versioning
• [n/a] Did you add any new tests as necessary?
• [x ] Is your PR rebased off the most current master?
• [- ] Have you squashed all commits? (can be done at merge)
• [x] Did you use yarn not npm? (important!)
• [x] Did you use Material-UI wherever possible?
• [x] Did you run yarn lint on the code?
• [x] Did you run all of your most recent changes locally to make sure everything is working?

[gitalink]

This is how it looks on my iPhone8. It would be nice for someone else to test other small screens.

[acthelemann]

I feel like this should scroll on overflow just in case, but I'll accept it

[gitalink]

I removed yarn.lock.

[gitalink]

I will check on scrolling, I agree it should scroll just in case. I thought it did scroll.