I'm just starting with SitePad and I'm becoming a big fan!
Is it possible to change the background color of an entire page?
Or is this property embedded in the theme and isn't editable?
In general, what is the meaning of "themes"? As far as I can tell, I can start with a theme and then modify it completely so that it's not recognisable anymore. Using all the widgets I can create a theme from zero.
Is it so? Or are there things that are locked within themes and that cannot be changed?
SitePad apply background colors and images to each row instead of applying it to whole theme. So you will need to edit the given row to apply your background color.