How can I change the header color on my product page?

[KaiStooney]

Hey, the header on the home page looks good, i have a transparent header so theres no edges. But the thing is when im on the product page its white and i cant seem to change it in either code or by themes. I use the theme dawn. Please help me to change the color on it, just in the product page.

[KaiStooney]

hello?