I am new to web development and I am working on Django framework in VSCode. I have been trying to make a user interface for the web application which has a menu on the left side of the screen and a nav bar on top which says "home page" (the image is below). There I need all the texts and photos to be in the rest part of the page, and when I scroll down I want only that part to move, like in a real web application. But I don't know how to do it, do I have to use JavaScript for that or can I just do it within HTML/CSS?
As you can see in the picture the paragraph covers the nav bar.
Thank you!