Rectangles defined with the object command can have individual styles. However, if the object is not assigned a private style then it inherits a default that is taken from the rectangle command.
Syntax:
set style rectangle {front|back} {lw|linewidth <lw>}
{fillcolor <colorspec>} {fs <fillstyle>}
See colorspec and `fillstyle`. `fillcolor` may be abbreviated as `fc`.
Examples:
set style rectangle back fc rgb "white" fs solid 1.0 border lt -1
set style rectangle fc linsestyle 3 fs pattern 2 noborder
The default values correspond to solid fill with the background color and a black border.