fix: add bottom margin to button container

[bryce-mcmath]

Summary of Changes

Just some bottom margin I forgot to add back after making a recent change to the proof requesting screen.

Related Issues

N/A

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7b81dcc) 61.54% compared to head (31b54a5) 61.54%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1060   +/-   ##
=======================================
  Coverage   61.54%   61.54%           
=======================================
  Files         170      170           
  Lines        5458     5458           
  Branches     1572     1572           
=======================================
  Hits         3359     3359           
  Misses       2075     2075           
  Partials       24       24           

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