How to add custom css to swagger UI in Golang?

Question

I'm working on a Golang project at the moment. As a framework, I use go-fibre. To implement swagger documentation, I utilize swaggo/swag and fibre-swagger. I need to modify my swagger output page (eg: Font size should be increased, colour should be changed, the logo should be removed. etc..). Therefore, in Golang, how do I apply custom CSS for Swagger? Thanks.