Hey there @N7AS,
Thanks for participating in the community!
To my knowledge, adding additional CSS to GoCentral isn't something you can do at this time. They are constantly updating the platform so that may be on the horizon.
If you need that capability at the current time, I would suggest utilizing the WordPress platform or another similar CSS.
Once your issue is resolved,
please be sure to come back and click accept for the solution
I have been able to add CSS to sections of my pages such as a CSS DropDown menu and styling <div> width and height. It would be nice to add CSS so it works globally and eliminating having to enter the same code in every section I want styling to appear such as CSS styled <blockquotes>.