I would like to shape this thing from 2001 A Space Odyssey, it's a connector to pressurize the suit

![2001](https://zupimages.net/up/22/35/sya8.png)

I began to add a cylinder, inset the top face, extrude it but now I don't know how to bevel it to make it rounder like in the picture above

![blender](https://zupimages.net/up/22/35/ilwx.png)

Sorry I couldn't find a better quality pic from this connector in the movie.

Thank you for your help :)