fix for praca.pl (#3908)
fix for praca.pl (#3908)

* fix for praca.pl

Change approach for company logos.
Earlier I was adding gray backgruound to see dark names in transparent logos and rest was white.
Invert looks nicer. :)

added some classes with logos to invert
alexanderby/darkreader,alexanderby/darkreader,alexanderby/darkreader,darkreader/darkreader,darkreader/darkreader,darkreader/darkreader