Using the Template module, go to your "root" page containing the root template and select "Info / Modify" from the top-right drop-down box, then "Click here to edit whole template record". Scroll down and:
- Section "Clear", check: Constants, Setup
- Check Section "Rootlevel"
- Section "Include static (from extensions)", add: CSS Styled Content (called: content.static (default) )
(Make sure you have the CSS Styled Content extension installed
already)