Full width video slider: how to turn off boders

Hi there,

I think this one have a trivial solution but somehow I just can’t figure it out, so thank you for your patient and help in advance. The thing is I would like to add a full screen video slider to some of my services pages, but for some reason there is always a side border or padding in the appearance instead of full screen stretch. I didn’t put the media element in 1/1 layout element or in color section. And the strange thing is that, if I use the same element with the same settings in a blank page it works well, it appears in that case stretched full screen view.
What should I do differently?

When it’s ok – blank page:

When it’s not:

Thank you!

David