Hidden top navigation Menu: best way to show it is there

I have a top header that is hidden because we want the customer to focus on the forms they are filling out and these footers and headers take up alot of real estate. So my question is what are some good ways to show that there is a hidden header that you can get to by hovering over a certain spot. here are some screen shots.

first one shows where i have a down arrow showing there is content up above that will appear

second picture shows the header appearing after hovered over down arrow.

The footer has a similar setup at the bottom with some animation.

Any suggestions for showing that there is a hidden header? I want the icon or something along the lines of one to be non invasive to the rest of the content. The focus isnt the header it is just there if they want to access other features.

Thanks!