Thank you @chrillek ! It works !
So to summarize for others who may need same solution :
- in your .MD file write your table with “|” and ‘-’ : you will see with “inspect” of your brower the “table” style called in the html code.
- add a file custom.css under assets/ananke/css if you have Ananke theme
- put inside this new css file styles adjusted from Styling tables - Learn web development | MDN
that 's it !
(easy in fact when you know how)