Solve for Modal Content Overflow

[natalynyu]

This PR adds the CSS property overflow to the ModalBody so that if the modal contents are larger than the modal itself, the user will be able to scroll through the contents. I added the CSS property to the body instead of the overall modal component so that the title of the modal would be 'sticky' and could always be seen.

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [X] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] I have run eslint on the code
• [x] I have added JSDoc for all of my code (where applicable)
• [ ] I have added tests to cover my changes.

Priority:

• [x] Normal
• [ ] High

Related Issues:

Addresses #235

[codecov[bot]]

Codecov Report

Merging #74 into develop will not change coverage. The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop      #74   +/-   ##
========================================
  Coverage    98.12%   98.12%           
========================================
  Files           41       41           
  Lines          480      480           
  Branches        87       87           
========================================
  Hits           471      471           
  Misses           5        5           
  Partials         4        4           

Impacted Files	Coverage Δ
src/Modals/ModalBody.tsx	75.00% <ø> (ø)

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[rmainwork]

Approved.