Вы можете попробовать следующую настройку:
Arguments: $FileName$:$ProjectFileDir$/themes/name/css/$FileNameWithoutExtension$.css
Output paths to refresh: $ProjectFileDir$/themes/name/css/$FileNameWithoutExtension$.css:$ProjectFileDir$/themes/name/css/$FileNameWithoutExtension$.css.map
Working directory: $FileDir$
![enter image description here](https://i.stack.imgur.com/BFkAu.png)