Simple question I think. How do you get a site to be both responsive and have the text, pictures to scroll under the header, I have seen some and think how is that done. I know someone out there will be able to do it, normally I go searching on YouTube.
You can do this with the help of layers panel. Create 2 or more layer and make sure the header content is in the top layer so that remaining content is stacked below header items.
Please take a look at the link below that explains more about layers panel.