CSS analysis is available starting in all editions of SonarQube.
Prerequisites
In order to analyze CSS code, you need to have Node.js >= 8 installed on the machine running the scan. Set property sonar.nodejs.executable to an absolute path to Node.js executable, if standard node is not available.
If you have a community plugin that handles CSS installed on your SonarQube instance it will conflict with analysis of CSS, so it should be removed.
Language-Specific Properties
Discover and update the CSS-specific properties in: Administration > General Settings > CSS
