After completing my CSS, I can't use it to challenge.i Don't understand why?

Question

using CSS in challenging

Answer 1

there is no challenges option of CSS and jQuery :(

Answer 2

Actually it is merged in HTML
as without HTML, Css is useless

Answer 3

thanks

Answer 4

there is no quiz factory for CSS :(

Answer 5

It works with HTML. If you've noticed, their questions appear in HTML challenges