explorer: added missing css stylesheet

[thelostone-mc]

Description

explorer: added missing css stylesheet to enable checkbox css

Checklist

• linter status: 100% pass
• changes don't break existing behavior
• commit message follows commit guidelines

Affected core subsystem(s)

• html

Refers/Fixes

• Issue Explorer Check-box Undone #744

[codecov]

Codecov Report

Merging #747 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #747   +/-   ##
=======================================
  Coverage   34.35%   34.35%           
=======================================
  Files         101      101           
  Lines        5621     5621           
  Branches      649      649           
=======================================
  Hits         1931     1931           
  Misses       3616     3616           
  Partials       74       74

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[thelostone-mc]

[mbeacom]

@thelostone-mc Thanks for pushing this!

[owocki]

i wonder if this is related at all #780

[thelostone-mc]

@owocki That's cause of this : #782