Im on phone so cant give you exact codes.
If you Open beautycase.lua There is a section that explains the function.
Something like "createborder(framename,size,r,g,b,adjustment)
Example for icon. Createborder(icon,3,1,1,1) last 8 digits is Rip adjust the texture
You Can change the border textures in the mediafolder.
Hope that makes sense