I have a page consisting of 1 row with 2 columns ( row '3+9 ').
In the first column ('col-3') I have one short addon
In the second column ('col-9') I have many addons below each other
I want the addon in 'col-3' to stay sticky when the user scrolls down & up to see all the content (of 'col-9').
How do I realize that?
