How to make such a ... element correctly and adaptively?

Question

css

Guys, I have such a block (the screen is attached below), there are 2 lists (on the left and on the right) and when you hover over the elements in the list, a window should appear with a couple of links inside. How can this be done and done adaptively?

Block what I have

The window that should appear

Answer 1

relativeabsoluteand help you inside

Answer 2

Like so? https://jsfiddle.net/ek4pk64n/