Syntax: set style textbox {opaquetransparent}
{{no}border {<bordercolor>}}{linewidth <lw>} {fillcolor <color>} {margins <xmargin>,<ymargin>}
This command controls the appearance of labels with the attribute 'boxed'.
Terminal types that do not support boxed text will ignore this style.
Note: The current implementation is experimental; details may change.
Implementation for some terminals (svg, latex) is incomplete.
Most terminals cannot place a box correctly around rotated text.