Single page design portfolio

This is the first time that i make a slider like the one in this page.

I don't know how to put a margin at the end, i tried to use chatGPT for helping, but couldn't figure out to fix this behavior. Another thing is: when the arrow buttons are clicked the section projects is called as it be a link and the page moves. Im not sure how to fix it too.

Need to study a bit more to understand the JS for this code. I would appreciate any feedback .