Vertically align checkbox input type

[fluix-dev]

This makes the checkbox input types vertically aligned.

Note: I originally tested this by just using the development console of Firefox, then trying to edit the necessary file and./make_style.sh. Unfortunately, I can't get it to add the css to the processed file and I'm not sure why. Perhaps I'm doing something wrong, either with generating styles or this actual code.

Before

After

[codecov-commenter]

Codecov Report

Merging #1465 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1465   +/-   ##
=======================================
  Coverage   45.85%   45.85%           
=======================================
  Files         208      208           
  Lines       11966    11966           
=======================================
  Hits         5487     5487           
  Misses       6479     6479           

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[fluix-dev]

Thank you @Carson-Tang for testing, the ./make_style.sh works and I've tested the output css.

[Xyene]

Thanks