coding issue with a height of a content container
hello, i may have troubles with putting my issue into words so bare with me (here's my site before making the changes im talking about, perhaps this would help with understanding what i'm tryna do: https://xavier.nekoweb.org/. my site is on nekoweb but the r/neocities is more active, that's why i post here, i hope it's ok)
what i'm trying to do is put a side column + middle content + another side column in one purple box. The middle content's height is put to fit-content, side columns don't have any height attributed.
Idk how to make the purple box that is supposed to contain all of this big enough to do so; when I put the height as fit-content it becomes very small as though it doesn't know it contains the columns and the middle part (pic) ... i can't set the box' height as any specific value, because the main content's height keeps changing
other pics below show some parts of the code, where the divs kolumny i kolumny2 are supposed to be the purple box, ad1 and ad2 are the columns and the tabcontent is the middle part
any ideas? thank you in advance^^