Live demo - External CSS
The example above shows how you can use Custom CSS Code for Confluence to style Confluence content by loading to external CSS files.
The configuration to load the external CSS https://unpkg.com/nes.css@2.3.0/css/nes.min.css
from the NES.css project and to include the font file https://fonts.googleapis.com/css?family=Press+Start+2P
looks as follows: