/* We clip out the transparent region inside the
   border so we can check that the shrinking of
   the inside works properly.
   Comment out the clip to see the actual border
 */

clip {
  /* blame sqrt(2) for those numbers:
     The shrunkrect should be 40 40 70 70 / 70 0
     70/sqrt(2) = 49.4974747...
     40 + 49 = 89 and 40 + 70 - 49 = 61,
     giving you:
   */
  clip: 61 61 28 28;
  child: border {
    outline: 0 0 150 150 / 150 0 150 0;
    widths: 40;
  }
}