How can I edit the colors in my header and footer?

Hello,

I am trying to transition the colors on a website I am working on from reds to blues. So far, the only changes I have been able to effectively make are when I go to Appearance > Customize > Custom CSS. I replaced all of the HEX values there. On the site, it has changed the colors of some elements, but not most. Mostly, the header and footer still has the reds and other colors that I need to update. However, I can’t seem to find out where to make edits to those colors. The site uses Elementor. Can someone please help me figure this out?

Thank you!

The page I need help with: [log in to see the link]