Hi, Lubi.
The way the footer backgrounds work is that the top portion of it is created with an image that has a gradient, and this blends in to the actual background colour of the footer. What you are seeing there is the footer background colour for skin 3, i.e. you have changed the background image colour but you haven’t changed the actual background colour. You’ll need to add a custom style that sets the footer background colour to whatever colour the bottom row of pixels in your background image is.
Go to Appearance > Design Settings > Edit All Default Design Settings and add the following style to your Custom CSS box:
#Bottom footer .main { background-color: red !important }
I don’t know what the hex is for that colour of blue you are using, you’ll need to find out what that is and then use it in the above style in place of red.
If you use the Internet Explorer, Chrome or Safari browsers you can use their built-in developer tools to point at and “inspect” elements on a web page to find out what styles they use. You can even tweak the styles live to experiment with any changes you might fancy. If you use Firefox then there is an add-on named Firebug you can install which gives that browser the same functionality as the developer tools built into the other browsers.
