I need a simple gatsby js site.
1. The site needs to work as slides when you scroll you go to the next slide scroll again next slide (3 slides)
2. In each slide, there needs to be a selector that you can drag to the left or the right like a window blind so you can reveal a before and after content
3. the before and after content needs to be a div with text + an image
4. this needs to be responsive and respond to a grid system so very good CSS