Mountain bike Product Landing Page Feedback

Here is my product landing page if anyone wants to have a look. I tried my best to be original

There are a few things I’m not happy with but don’t know how to fix.

  1. I can’t get the .navbar to sit at the top of the page, even though the top margin and padding as well as the page margins are all set to 0.
  2. When the website resizes responsively, the main image of the bike sits directly below the contact box. I set this at a margin from the top, which means the gap gets bigger and bigger as the image gets smaller. Is there a better way to do this?
  3. Also, does anyone know why my title bar flows right to the edge on the right screen? I tried setting right padding and margins to 0 but with no luck.

Thanks for all feedback