I want to create a template that includes my own CSS without the Bootstrap and Foundation framework defaults.

I would also prefer to define my own Breakpoints.

Please advise. Many thanks!

CSS Grid Builder - Version 2.5 - Build 254 (Registered Version)

I dont think That is not going to be possible with this software.

If you were using the programme Site Designer (SDv3 for short), you could to some extent do that if you select the Vanilla template. There is a version for building 'desktop down', and one for 'mobile-up'. The templates come without any breakpoints, so that will be up to you where to set them.

I would think you could override any css by placing your own style sheet link in and targeting the elements.
You can try removing the style sheet link with JQuery.

or disable it.

Thanks to all of you who replied. Much appreciated.

I should have read the CSS Grid Builder instructions first before rushing in...

My goal is to create a static site. I am proficient in HTML and CSS. I just wanted a CSS Grid visualization tool to speed things up.

CSS Grid Builder is a powerful piece of software. No doubt about it. I hope that it will grow without the need for existing CSS or Javascript frameworks, or dependency on other software.

I wish CoffeeCup and the developers of CSS Grid Builder all the very best with continued success.