heading Can't change header background color

I've been trying to change the header color in my trial website but it never saves and defaults back to it's original settings. Also, the background color shows on every page before the header image loads. It's frustrating because the color does not match the color theme on each page. I've tried custom CSS to make the header background transparent yet the orange background is still there. I'm at a loss as to what to do. I've also tried image sizes at various sizes for faster loading but the background still shows.

Hi. What is site url?