Use your mouse to scroll! Try in fullscreen so the actual website (scratch) doesn't scroll!
I wanted to make this so I looked at scratch and I was on the right track but I needed help so I took a quick glance at https://scratch.mit.edu/projects/64717098/ and I realized I could change it from knowing you are scrolling but not the direction to knowing both! so credit to @NuclearBlaster for the revelation! scratch team for the scratch logo, giga ne
