You can resize the graphics window by dragging the lower-right
corner of the Frame. Each time you resize, Java clears the window and
invokes paint again, which invokes paintBox, which makes
your program redraw the snowperson according to the new window size.
As you resize the screen, the snowperson should always touch the top
and bottom of the screen, and the three ovals should touch, and the
proportion of the three ovals should stay the same.