CSS conflict tutorial missing

here in FAQ section you write:

CSS conflicts

If your forms do not look as expected, chances are there’s some CSS in your theme conflicting with the built-in CSS of Visual Form Builder. Please follow the tutorial on how to customize the CSS.

pointing to this URL:
https://matthewmuro.com/2012/11/15/visual-form-builder-pro-customizing-the-form-design/

but:
Oops! That page can’t be found.

thanx