Gtk.BorderStyle

Describes how the border of a UI element should be rendered.

BorderStyle.NONE

No visible border

BorderStyle.SOLID

A single line segment

BorderStyle.INSET

Looks as if the content is sunken into the canvas

BorderStyle.OUTSET

Looks as if the content is coming out of the canvas

BorderStyle.HIDDEN

Same as @GTK_BORDER_STYLE_NONE

BorderStyle.DOTTED

A series of round dots

BorderStyle.DASHED

A series of square-ended dashes

BorderStyle.DOUBLE

Two parallel lines with some space between them

BorderStyle.GROOVE

Looks as if it were carved in the canvas

BorderStyle.RIDGE

Looks as if it were coming out of the canvas