fix: Sphinx button border and transparency style in docs

[Revathyvenugopal162]

fix #1900

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.07%. Comparing base (bbc02ed) to head (97e4dc8).
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1914      +/-   ##
==========================================
- Coverage   88.12%   88.07%   -0.06%     
==========================================
  Files          83       83              
  Lines        9963     9963              
==========================================
- Hits         8780     8775       -5     
- Misses       1183     1188       +5     

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