Hello Robert,
You can create a complete new website using the framework just by using the front-end and back-end editor. Changing the template.css file is not necessary in such case. However, if you want to use custom CSS, I have already told you the method which is even more organized than ever, more user-friendly you can say.
Most importantly, editing template.css is no way recommended from us as after every update, it will be gone.
So, it's even easier now to create your own site with zero coding knowledge.
I hope you can understand.
Thanks!