fix: isolate fieldset styles to legacy catalog (resolves #368)

[greatislander]

Resolves #368.

• Functional
• Attractive

[codecov-commenter]

Codecov Report

Base: 0.00% // Head: 0.00% // No change to project coverage 👍

Coverage data is based on head (e804c10) compared to base (bf6ac8c).
Patch has no changes to coverable lines.

Additional details and impacted files

@@          Coverage Diff          @@
##             dev    #370   +/-   ##
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  Coverage   0.00%   0.00%           
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  Files          7       7           
  Lines        595     595           
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  Misses       595     595           

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[SteelWagstaff]

Definitely more functional. We'll likely want to make some aesthetic improvements before next release, but this is great start. We'll take it from here -- thank you Ned!