/*  Works as expected in Firefox 2.0.x & Opera 9.5.
*/
p.code
{
  /*
  background-color: #101020 !important;
  color: #eee !important;
  */
  overflow: auto;
  height: 50ex;
  /*  'overflow' takes care of the width by itself.
  width: 100ex;
  */
}