Reposition Gallery

Hi,

I would like to place Gallery thumbs by the right side of the video in vertical manner. Could you please guide me how to accomplish this?

https://drive.google.com/file/d/1uryI5XdzR59AYtoh3AUPq0xQ4K1s48r_/view?usp=sharing

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