Remove space below a video [Using FluidEngine!]

Site URL: https://marlow-concept-zach-naum.squarespace.com/

Hi there

I've added a video block and am trying to set it to fill a section of a "grid" layout. It looks fine on desktop but on a smaller screen a gap appears below the video. 

See attached with the gap (laptop screen) v no gap (monitor).

I've made sure there is no caption/description below the video... maybe it is a placeholder space for this?

Please note that I've used FluidEngine for this! As it's easier to work this layout than on the regular editor. 

@tuanphan maybe you could assist?

Password is willow123

Thank you!

Sanice