Can I add pading to the left and right of the nav bar?

I have been looking over the nav. bar settings for a way to add just a bit more spacing on the left and right sides. I see that I can add a border to the sides or more spacing between each item or set the max width.

The border feature is probably the closest to what I am looking for but it seems to add a solid color boarder when my nav. bar is transparent. Is there just a way to bring the sides in a bit more while keep that same black transparent?