fix(styles): correct persistent unneeded vertical scrollbar

[adamnel]

Description

Bottom margin on main card was conflicting with calc values in CSS for the card heights and causing a vertical scrollbar. This reverts that change.

General Tests for Every PR

• [x] npm run start still works.
• [x] npm run lint passes.
• [x] npm run stylelint passes.
• [x] npm test passes and code coverage is not lower.
• [x] npm run build still works.

[owilliams320]

:tada: This PR is included in version 8.19.1 :tada:

The release is available on:

• v8.19.1
• GitHub release

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