forehead { margin: 4em; width: 8em; border-left: solid black 1em; border-right: solid black 1em; background: red url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAIAAACQd1PeAAAADElEQVR42mP4%2F58BAAT%2FAf9jgNErAAAAAElFTkSuQmCC); /* that's a 1x1 yellow pixel PNG */ }
   .forehead * { width: 12em; line-height: 1em; }

   /* class selectors headache */
   .two.error.two { background: maroon; } /* shouldn't match */
   .forehead.error.forehead { background: red; } /* shouldn't match */
   [class=second