table {
	empty-cells:show;
}
.frame { border-style:solid; border-width:4px; border-color:black; }
.shell { font-family:Courier;
      padding:2px; padding-left:6px; padding-right:6px;
      border-style:solid; border-width:1px; border-color:gray;
      color:lightgreen;  background-color:black;
}