Making pages full width on Canard theme

Hello

I am using the Canard theme and have managed to delete sidebars from my pages however can’t work out how to make page content full width.

AS you can see here: https://eppie.me.uk/video-editor/

I’m not a CSS expert in any sense of the word but am good at following instructions!

Any help would be great thank you.

Eppie