Sections - width is different in Smartfone and tablet

I created a 1 sections wide dashboard.
on my smartphone there is a very smal gap on the left/right side.

but on my 7" Firetablet ther ist a big gab on both sides
image

if using another 10" Tablet the gap is much bigger
if using masonary and grid there is no gap

is it possible to reduce the gap?