How change suffix

Hi,
this gavick template dumbo again

I try to change the appearance of grid 1-I module into suffix DARK

But nothing happens?
Any good tips?

hi,
1) did you added one space before suffix name?
2) show me exactly where you added this module with suffix

I used a custom HTML module in Position grid 1-IX (between the black-violet and twitter icon)
http://xtasy4u.de/

In module advanced settings I tried several options - I think I overlook some stupid error again, sorry;-)

you can also use small letters : dark.
remember that some modules uses its own styles so our dark bg might not work for them.

Don't get it:-(
can you tell me if i works with the custom html module position 'footer_nav' in "instyle" template?

and what is the good writing for Module Class Suffix?

dark (one empty space)
_dark (underscore)

or any else like " or any symbol?

one space then suffix name