Moves the corners of a rectangle inwards by a given amount.
inset-rectangle rectangle dx dy &optional dx-right dy-bottom
rectangle
A list of integers
dx
An integer
dy
dx-right
dy-bottom
The inset-rectangle function moves the left , top , right and bottom elements of rectangle inwards towards the center by the distances dx , dy , dx-right and dy-bottom respectively.
inset-rectangle
By default, dx-right is dx , and dy-bottom is dy .