If you notice at the demo, we use 2 different logos for each occasion. At the homepage, look that the logo is over a dark background, but in the inner pages the background is white. So in the first occasion you might need a logo with white text, while for the inner pages you might use a logo with dark text.
For this reason we created the option to have 2 different logos to use. These options are under Theme Options > General Settings.
The first logo option is the
Custom Logo (Light). Here you must use the logo that you want to show when you are using a dark background.
The second option is the
Custom Logo (Dark). Here you must upload the logo to use on a white background, like the inner pages.