Custom CSS configuration was added in
next.config.js which disables the built-in CSS/SCSS support to prevent conflicting configuration.
A legacy plugin such as
@zeit/next-css being added in
next.config.js can cause this message.
If you would like to leverage the built-in CSS/SCSS support you can remove any custom CSS configuration or any plugins like
@zeit/next-sass in your
If you would prefer not to leverage the built-in support you can ignore this message.