Hi there, congrats for great article.

I wasn’t able to make it work, I’m unfamiliar with this SASS. I don’t think I’m able to use it. Should I just add CSS on the theme options for example?

Did you guys tried to use the Boostrap Style on inputs like this example with URL Address? I’m unable to reproduce it on my website. :/
http://v4-alpha.getbootstrap.com/components/input-group/

Cheers!