Greetings,
On FCC tutorial codepen intro step 6, the following text does not account for selecting Bootstrap 3 or 4:
Click the gear in the upper left hand corner of the CSS box, then scroll down to “Quick add” and choose Bootstrap. Now give your h1 element the class of text-primary to change its color and prove that Bootstrap is now available.
Should 3 or 4 be used for front-end development?
Cheers
J