Make box black

Hello I have 7.3.2 and I'm trying to use customize site layout and was wondering if I could do this? Make the white boarder box black instead of white.

Many thanks,

M

By default only page background, border and font is changeable, so it'll work in almost any custom template. However it's possible to add more styling options almost for anything by adding records into `bx_profile_custom_units` table.