You can change it from Appearance >> Customize >> WooCommerce >> Store Notice as per your requirements as showing in this screenshot: https://ibb.co/tmPQSY7
You need to change the primary color of the theme from Theme Settings >> Styles & Colors >> Primary Colors. Because it inherits from the primary color of the theme.
So if you want to change only the color of WooCommerce notice then you need to use the Following Custom CSS code in the Global Custom CSS area under Theme Settings >> Custom CSS.