Feature Request for “Space between top of page and sticky element:”

Hi,

Thank you the great plugin! Please add an option to either be able to enter a CSS selector for “Space between top of page and sticky element” or alternatively just be able to add a different value for smaller screens.
The idea is to be able to use different spaces from the top of the page for desktop and mobile, because header sizes often differ.

Many thanks in advance,

Anguel