Always show opera viewport dimensions?

Question

Opera

How to make it so that you always see the dimensions of the browser window? And not only when the debugger is open?
I downloaded Opera Developer Tools but there is no function to show always. You have to click constantly to see the dimensions. I also found in the documentation of the opera that you can enable it in the browser settings, I did not find such an option.

Answer 1

https://jsfiddle.net/dfsnrx96/