Here are some basic colours in Slovak. Check them, learn them and try in sentences.
what is your favourite colour?/ aká ja tvoja obľúbená farba?
my favourite colour is…/ moja obľúbená fabra je…
what color is your car?/akú farbu má tvoje auto?
my car has a ….. colour/ moje auto má …. farbu
this is a nice colour/ to je pekná farba
this is interesting colour/ to je zaujímavá farba