Fix: adjust left margin on content container

[timoransky]

• What kind of change does this PR introduce?

This very small PR fixes a bug for the wrong left margin on the content container which was not in line with the sidebar width.

• Why was this change needed?

Part of the content was hidden behind the sidebar on certain viewport sizes.

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[codecov]

Codecov Report

Merging #515 (65d431c) into main (66fd402) will not change coverage.
Report is 36 commits behind head on main.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #515   +/-   ##
=======================================
  Coverage   17.50%   17.50%           
=======================================
  Files          59       59           
  Lines        2719     2719           
=======================================
  Hits          476      476           
  Misses       2243     2243           

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