I am in the process of building a website and we want the header shrink when you scroll down the site. We would like the logo to stay but the menu bar to disappear. Currently when you scroll down, the entire header scrolls with it so when you get to the text part of the site, it's hard to read. I have 4 images attached. The first 2 show our site and what happens when we scroll. The 2nd two show more of how we would like it to work. Is this possible and if so, what do i need to do? Thanks so much!