support inline css

[cornelk]

Close #36

[codecov]

Codecov Report

Attention: Patch coverage is 89.21569% with 11 lines in your changes missing coverage. Please review.

Project coverage is 47.20%. Comparing base (d8c9a58) to head (97edc5e).

Files with missing lines	Patch %	Lines
css/css.go	68.18%	5 Missing and 2 partials ⚠️
htmlindex/htmlindex.go	93.22%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #51      +/-   ##
==========================================
+ Coverage   45.22%   47.20%   +1.97%     
==========================================
  Files          14       14              
  Lines         754      786      +32     
==========================================
+ Hits          341      371      +30     
- Misses        363      364       +1     
- Partials       50       51       +1     

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