The amount of css rules required for this plugin is quite high. To accomodate the moodle plugin practice of plugin specific css selectors, this makes the css rules quite hard to maintain. Unfortunately, moodle does not extend the sass/scss compiler support to plugins that are not a theme. To alleviate this, this plugin includes it's own scss compiler script that compiles all scss files in this directory into one css file - css/devstyles.css This files is used instead of styles.css in order to avoid having to clear the theme cache every time a style rule is changed during development. Once I devise a method to use styles.css in production environtments and css/devstyles.css production environments, the compiler will compile it into both css/devstyles.css and styles.css Call the plugin's scss compiler by running scssbuild.sh in the plugin's root.