Padding added to video top and bottom

When I make the browser window smaller in chrome or view on an android phone padding is added to the video top and bottom?
Vimeo get around this with its responsive embed code, but one can only paste the url into the box on the post page.

https://www.bravehound.co.uk/mobile2.png
https://www.bravehound.co.uk/stv-jimmy-and-bracken/

thanks in advance

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