Layout side padding

Hi there,
in theme Options  in Global -> Advanced

LAYOUT
Boxed Layout | Side padding   i set the value  to 0%  or 0px
because I do not want to have a margin between object and sheet.
But as you see in the image I share on this link  https://postimg.cc/Z0458crt
there is still a small margin.
I try to modify the padding value of the section conteins my text but is still there.

How can fix this? Can I add a custom CSS code?
Thank you and best regards

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