Ask HN: How should I digitally whiteboard?

I have a technical interview coming up where I need to "whiteboard" via a video connection where I'm sharing my desktop screen. I asked the recruiter, and she said they provide/require no special software environment à la leetcode.

How do you recommend going about this? Should I write code in VIM? Download something that allows us to pair program? Use Google Docs? I'm mainly just wondering what is commonplace in this situation.