Create a different header for each page
I would like to add a different header to some of my pages, under the menu bar. What I've already done was to add a photo, but I would like to stretch it to occupy all the width of the page, while keeping the rest of the content at 1200px in width. But I don't know who I can do that. Does anyone know the CSS code for this?
This is what I have now: https://danielsantosphoto.com/Prints/Store
Thank you so much!