Style multi step form

I’m trying to style the multi-step form and see these 2 links that explain how make this happen:
https://github.com/impress-org/givewp-snippet-library/blob/master/form-customizations/css-customizations/multi-step-inline-styles.php

https://github.com/impress-org/givewp-snippet-library/blob/master/form-customizations/css-customizations/multi-step-enqueue-css.php

Both are going to ‘page not found right’ now. Can they be found elsewhere? Or does the solution not work anymore?