CSS Styles with SASS
One of the first things you’ll want to do after you install Decidim is applying your own corporative image. To do this, you can go to app/assets/stylesheets/application.css.sass on your generated application with your own colors. There you can override any class using CSS with SASS.
We use SASS, with SCSS syntax as CSS preprocessor.
Also you can check your scss files syntax with
scss-lint
Accesibility
To maintain accesibility level, if you add new colors use a Color contrast checker (WCAG AA is mandatory, WCAG AAA is recommended)