• On a small screen [1], the edges of the page get a little smushed up. I'm also not sure if the "learn more" button is supposed to be transparent (it looks like it shouldn't be).
• This window [2] felt like I could move it, but I found that I could not. It's by no means a problem usability wise, but it felt strange that it wasn't possible.
• I sort of expected there to be a "preview" button in the title bar. I realise that it is a WYSIWYG editor, though I'm not sure how the page will look when it's fully published.
• The two sign up buttons look out of place, typically a page like this has one big and loud call to action. The one in the top bar isn't centred vertically either, which looks a little strange.
• The spelling of the buttons "Sign Up" and "Signup" should probably be made consistent too.
It's all nit-picky stuff, but I hope some of it is useful to you.