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I'm using proportal, is it possible to use background image in ONE of the blocks?
I do not want to change the background on all blocks, just one of them.

Give one of the blocks a class and then style it.

ok, I take that part. BUT how can i (split) portals bloks, the announcement I make, comes up at the portal.php, and I want to have a bg img at one of them. When I look at the codes from portal.php, I can't understand where I should make a class.