@namespace url(http://www.w3.org/1999/xhtml);

*[accesskey]::after {
  text-transform: uppercase !important;
  border: 1px solid gray !important;
  background-color: rgb(220, 220, 220) !important;
  color: black !important;
  -moz-border-radius: 4px !important;
  content: attr(accesskey) !important;
  margin-left: 2px !important;
  padding-left: 3px !important;
  padding-right: 3px !important;
  font-family: monospace !important;
}
*[accesskey]:focus::after{
 background-color: yellow !important;
}