Sticky Side Nav Bar Overlap Problem

I’m having a problem with my sticky side navigation bar. I followed tutorials to create it, and it generally works fine. However, when the height of my window is reduced, the sidebar overlaps the content at the bottom. I’m unsure how to resolve this issue. Here’s a screenshot
demonstrating the problem when I reduce the window height, and below is the read-only link.

Thank you for any assistance

Here is my site Read-Only: Webflow -