Black Corners on Online Box

Hello Ragezone, i'm having this really shitty problem where i cant remove these black thingys in the corners of the online box on my hotel, and since im a little bit of an perfectionist then little stuff like this can really fuck up everything for me, so ye please help. I am using illumina cms the xen edit.. And guys please dont just say something like.. its an image you must edit, cause that i cant use for anything might put you post count up with one but thats not for any help so instead tell me the name of the image i must edit if thats the case but i dont think its an image, anyways thanks.
http://i.imgur.com/vSZa9D5.png

You'd have more replies by now if you'd actually posted the relevant code associated with the users-online box (CSS and​ HTML).