Fix: fix small detail on gallery preview styling (PR #2199)

This adds a distance between the left and right navigation arrows and the left/right borders of the container or web page.

GitHub

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 97.92%. Comparing base (9ce99c3) to head (2d07bdf).

Additional details and impacted files
@@           Coverage Diff           @@
##              dev    #2199   +/-   ##
=======================================
  Coverage   97.92%   97.92%           
=======================================
  Files         160      160           
  Lines       23342    23342           
=======================================
  Hits        22857    22857           
  Misses        485      485           

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