How do I use a custom CSS for only one page?

Hi!

I have a demo-page (01.demo) where I want to do some testing. How can I add a custom CSS for this page?
I created 01.demo/style.css and need to know now, how to refer to this CSS-file.

Thanks in advance!

There is a plugin called assets that provides this functionality. Check out the README.md: https://github.com/getgrav/grav-plugin-assets