Change the colour of announcement banners
While we do not provide a configuration tool to change the look of your banner, we've made it possible to change the colour per type using CSS. Banner colours are set on a global level, so any changes you make to the banners will apply to all banners of that type on your entire site.
Each banner type has a CSS class, for example class="rw_announcement_banner rw_type_warning". Find the class using the inspector tool of your browser.
Set the colour of your banner using the class.
Add the CSS to Refined Administration > Themes & Styles > Custom CSS and HTML.
Refined is not supporting issues caused by custom CSS or HTML.