I'm using the Coraline theme with a child theme, though this issue
is probably relevant in any theme.
If you look at my blog (www.bigshotmoms.com) and scroll down to the bottom, you'll notice that I have a sidebar widget that is set to "fixed." Now that I have this new, amazing, full width footer, that fixed widget scrolls over it. Is there any way that I can use another php file in my child theme directory (perhaps sidebar.php ???) to tell the fixed widget that my page ends earlier than it really does, so it will stop before covering my footer ad?