Creating a Website with 3 Pages

Hey guys,

I’ve learnt how to code in HTML and CSS using codepen, but I don’t know how to merge the 3 pages I’ve created into one website. No JS, just HTML and CSS
Kindly how do I create a website that has 3 pages? I’ve tried using github but got stuck.

You can create a service like

It’s similar to codepen, but you can create different files.