Fixed sidebar

Hello.

Very new to wordpress and not so great at coding so I’m very much a fresher in the school of trial and error.

I was wondering if it is possible to make the sidebar static so that it doesn’t scroll as you scroll through the content of a page.

Ideally I’d like to have it so that the header and the sidebar are static and only the content that I’ve posted scrolls.

If I can make this happen what syntax would I need to change and in which pages?

Thanks in advance.