Hello pankaj
Well, thank you for your help, but this is not quite what I was asking for. I could achieve this effect easily by simply making a logo with white background instead of a transparent one, but the goal was to make it behave the same as the "Siggi" logo in the template, which turned out to be a text in a nice font - normally it's black, but on the Aside Menu it turns white. There must be a way to make a similar thing with an image-logo. Or, if that's impossible, the other option would be to get rid of the logo in Aside Menu completely. Unfortunately, I don't know how to make either of these changes (but it's quite obvious that two logos are needed in this case, and I'm pretty sure other Siggi users will have a similar problem).
