I'm sure this has been asked a million times before, but I have searched without success.
Firstly, I acknowledge I'm a massive n00b when it comes to CSS (sorry folks).
I've tweaked a form with the basic theme (it seemed the safest place to start), and then added in custom CSS on the basic theme .
When I preview the form, I can see my CSS changes.
I close and approve the form, but when I view the form in a test landing page my CSS isn't present.
What blindingly obvious step am I missing?