help with custom sidebar

Hello I’d like to use your plugin for this page:
https://biciclette.cc/listing/brompton-explore-m6e-extended-seatpost/

In particular I’d the to have sticky the “sidebar” with the following class:

.col-md-5

I set the class Settings > Wp Sticky Sidebar but It doesn’t work right.
Could you help me, pleasse?

Thank you!

The page I need help with: [log in to see the link]