Grid theme and fixed styles

[smhigley]

Type: eature

The following has been addressed in the PR:

• There is a related issue
• All code matches the style guide
• Unit or Functional tests are included in the PR

Description:

Resolves #584

[codecov]

Codecov Report

Merging #597 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #597      +/-   ##
==========================================
+ Coverage   98.91%   98.91%   +<.01%     
==========================================
  Files          42       42              
  Lines        3030     3035       +5     
  Branches      813      813              
==========================================
+ Hits         2997     3002       +5     
  Misses         33       33

Impacted Files	Coverage Δ
src/grid/widgets/Grid.ts	84.28% <100%> (+0.22%)	⬆️
src/grid/widgets/Body.ts	95.49% <100%> (+0.04%)	⬆️
src/grid/widgets/Footer.ts	100% <100%> (ø)	⬆️
src/grid/widgets/PlaceholderRow.ts	100% <100%> (ø)	⬆️
src/grid/widgets/Row.ts	89.47% <100%> (+0.58%)	⬆️
src/grid/widgets/Cell.ts	100% <100%> (ø)	⬆️
src/grid/widgets/Header.ts	100% <100%> (ø)	⬆️

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