gecko-dev/toolkit/themes/pinstripe/global/notification.css

@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");

notification {
  padding: 3px 3px 4px;
  text-shadow: none;
}

notification[type="info"] {
  color: rgba(255,255,255,0.95);
  background: url("chrome://global/skin/notification/info-bar-background.png") #404040 repeat-x top left;
  border-top: 1px solid #707070;
  border-bottom: 1px solid #2a2a2a;
}

notification[type="warning"] {
  color: rgba(0,0,0,0.95);
  background: url("chrome://global/skin/notification/warning-bar-background.png") #ffc703 repeat-x top left;
  border-top: 1px solid #ffe970;
  border-bottom: 1px solid #bf8a01;
}

notification[type="critical"] {
  color: rgba(255,255,255,0.95);
  background: url("chrome://global/skin/notification/critical-bar-background.png") #980000 repeat-x top left;
  border-top: 1px solid #e35959;
  border-bottom: 1px solid #5d0000;
}

.messageImage {
  width: 16px;
  height: 16px;
  margin: 0 4px;
}

/* Default icons for notifications */

notification[type="info"] .messageImage {
  list-style-image: url("chrome://global/skin/notification/info-icon.png");
}

notification[type="warning"] .messageImage {
  list-style-image: url("chrome://global/skin/notification/warning-icon.png");
}

notification[type="critical"] .messageImage {
  list-style-image: url("chrome://global/skin/notification/error-icon.png");
}

.notification-inner {
  border: 0 !important;
}

.messageText {
  margin: 0 3px !important;
  padding: 0;
  font-weight: bold;
}

.messageCloseButton {
  -moz-appearance: none;
  padding: 0;
  margin: 0 2px;
  list-style-image: url("chrome://global/skin/icons/closetab.png");
  border: none;
}

.messageCloseButton > .toolbarbutton-text {
  display: none;
}

.messageCloseButton:hover {
  list-style-image: url("chrome://global/skin/icons/closetab-hover.png");
}

.messageCloseButton:hover:active {
  list-style-image: url("chrome://global/skin/icons/closetab-active.png");
}

.messageCloseButton:-moz-focusring > .toolbarbutton-icon {
  border-radius: 10000px;
  box-shadow: 0 0 2px 1px -moz-mac-focusring,
              0 0 0 2px -moz-mac-focusring inset;
}

/* Popup notification */

.popup-notification-description {
  max-width: 248px;
}

.popup-notification-menubutton {
  -moz-appearance: none;
  margin-top: 17px;
}

.popup-notification-menubutton:not([type="menu-button"]),
.popup-notification-menubutton > .button-menubutton-button,
.popup-notification-menubutton > .button-menubutton-dropmarker {
  color: #fff;
  text-shadow: 0 -1px 0 rgba(0,0,0,.5);
  border-radius: 12px;
  border: 1px solid rgba(0,0,0,.65);
  background: -moz-linear-gradient(rgba(110,110,110,.9), rgba(70,70,70,.9) 49%,
                                   rgba(50,50,50,.9) 51%, rgba(40,40,40,.9));
  box-shadow: inset 0 1px 0 rgba(255,255,255,.2),
              inset 0 0 1px rgba(255,255,255,.1),
              0 1px 0 rgba(255,255,255,.1);
  background-clip: padding-box;
  background-origin: padding-box;
}

.popup-notification-menubutton:not([type="menu-button"]) {
  padding: 2px 9px;
}

.popup-notification-menubutton > .button-menubutton-button {
  -moz-appearance: none;
  margin: 0;
  padding-top: 2px;
  padding-bottom: 2px;
  -moz-padding-start: 8px;
  -moz-padding-end: 5px;
  -moz-border-end: 1px solid rgba(0,0,0,.65);
}

.popup-notification-menubutton > .button-menubutton-dropmarker {
  padding-top: 7px;
  padding-bottom: 7px;
  -moz-padding-start: 5px;
  -moz-padding-end: 8px;
  margin-top: 0;
  margin-bottom: 0;
  -moz-margin-start: -1px;
  list-style-image: url("chrome://global/skin/arrow/arrow-dn-white.png");
}

.popup-notification-menubutton > .button-menubutton-button:-moz-locale-dir(ltr),
.popup-notification-menubutton > .button-menubutton-dropmarker:-moz-locale-dir(rtl) {
  border-top-right-radius: 0;
  border-bottom-right-radius: 0;
}

.popup-notification-menubutton > .button-menubutton-button:-moz-locale-dir(rtl),
.popup-notification-menubutton > .button-menubutton-dropmarker:-moz-locale-dir(ltr) {
  border-top-left-radius: 0;
  border-bottom-left-radius: 0;
}

.popup-notification-menubutton:not([type="menu-button"]):hover:active,
.popup-notification-menubutton > .button-menubutton-button:hover:active,
.popup-notification-menubutton[open="true"] > .button-menubutton-dropmarker {
  background: -moz-linear-gradient(rgba(40,40,40,.9), rgba(70,70,70,.9));
  box-shadow: inset 0 0 3px rgba(0,0,0,.2),
              inset 0 1px 7px rgba(0,0,0,.4),
              0 1px 0 rgba(255,255,255,.1);
}

.popup-notification-closebutton {
  -moz-margin-end: -12px;
  margin-top: -13px;
}

.popup-notification-closeitem > .menu-iconic-left {
  display: none;
}