How to make an email submit to a static page?

I’m doing the landing page challenge, User Story #12: When I click the #submit element, the email is submitted to a static page (use this mock URL: https://www.freecodecamp.com/email-submit). How do I make this? Also, why doesn’t the title show then I’m on mobile mode? (Dev tools and the first phone option) Also, why is then I was working with media I didn’t change that would only affect the media query but whose changes messed up my website in normal mode. And why isn’t width:; isn’t working in #video {}?
Product Landing Page

You should check back in the curriculum, most if not all requirements have been covered at some point before the final challenge projects.