Are portal style sheets used in WPC?
No. SAP delivers additional style sheets for web forms and for web page composer content. Currently, WPC does not use stylesheets managed by the portal theme editor, and instead WPC has its own stylesheets located in the /etc/wpceditor/css repository. Web forms use a combination of XSL transformations (stored as XSL files in /etc/wpceditor/styles) which reference the corresponding style classes and IDs of the WPC stylesheets to render the web forms at runtime. It’s strongly recommended not to change the default styles and transformations delivered by SAP but to create custom stylesheets and transformations (or work on copies of the original ones).