Hello,

I saw the screenshots you attached.

You can change the Notices color from Theme Settings >> Styles & Colors.

Screenshot for Clarification: https://gyazo.com/fb34baae7778b804924e8600f4fee19e

And you can change the categories style from Theme Settings >> Product Archive >> Categories style.

Screenshot for Clarification: https://gyazo.com/f0f2dafcacc90c186aa035cc90c0567e

Best Regards