Split screen one-page website, need help for sticking please

Hello,

I found this cool personal website that I liked where the individual’s image was sticky on the left side, and scrollable on the right. Link here; https://thomas-kessler.ch/

I then went hunting for a template like the website mentioned and found a Webflow template that I’ve been using to build my own info. The Webflow template is here; Split - One Page Personal Site - Webflow

However, my image is square meaning it takes up lesser space and I don’t think it’s sticking (or acting as a header and footer in the left content as I’d like), and it continues to scroll the entire page as a result of the text in the right content.

READ ONLY LINK; Webflow - Niall's Awesome Site

Can anyone please give me guidance on how to make the left content stick from top to bottom please?

Thanks!


Here is my site Read-Only: LINK
(how to share your site Read-Only link)