gecko/toolkit/themes/pinstripe/mozapps/extensions/eula.css

#heading {
  font-size: 120%;
}

#eula {
  -moz-appearance: none;
  font-family: monospace;
  color: -moz-dialogtext;
  background-color: window;
  margin: 1em 0 1em 0;
  border: 1px solid;
  -moz-border-top-colors: ActiveBorder;
  -moz-border-right-colors: ActiveBorder;
  -moz-border-bottom-colors: ActiveBorder;
  -moz-border-left-colors: ActiveBorder;
  border-top-right-radius: 0;
  border-bottom-left-radius: 0;
}