The background Color of the title in the pages

Try using – for example – a tool like Firefox with the Firebug add-on for this kind of CSS work. https://getfirebug.com/ . Help info on Firebug https://getfirebug.com/faq/

Tara, that doesn’t work as it will not hold the changes you make with Firebug by putting them in the CSS. I just tried it.

you just use firebug to test the changes. If they look like they work then do them for real either within a child theme or the custom CSS section.

Hope that helps.