diff --git a/css/ol.css b/css/ol.css
index ca843c03bb..e2c7f4cec9 100644
--- a/css/ol.css
+++ b/css/ol.css
@@ -139,14 +139,13 @@
   border: none;
 }
 .ol-zoom button::-moz-focus-inner,
-.ol-zoom-extent button::-moz-focus-inner {
+.ol-zoom-extent button::-moz-focus-inner,
+.ol-full-screen button::-moz-focus-inner {
   border: none;
   padding: 0;
 }
 .ol-zoom-extent button {
-  font-size: 16px;
-  line-height: 22px;
-  border-radius: 2px;
+  line-height: 1.4em;
 }
 .ol-touch .ol-zoom button,
 .ol-touch .ol-full-screen button,
diff --git a/src/ol/control/zoomcontrol.js b/src/ol/control/zoomcontrol.js
index 4db00f511f..7588d8842b 100644
--- a/src/ol/control/zoomcontrol.js
+++ b/src/ol/control/zoomcontrol.js
@@ -43,7 +43,6 @@ ol.control.Zoom = function(opt_options) {
       options.zoomOutTipLabel : 'Zoom out';
 
   var tTipZoomIn = goog.dom.createDom(goog.dom.TagName.SPAN, {
-    'class': '',
     'role' : 'tooltip'
   }, zoomInTipLabel);
   var inElement = goog.dom.createDom(goog.dom.TagName.BUTTON, {
@@ -58,7 +57,6 @@ ol.control.Zoom = function(opt_options) {
   ], goog.partial(ol.control.Zoom.prototype.zoomByDelta_, delta), false, this);
 
   var tTipsZoomOut = goog.dom.createDom(goog.dom.TagName.SPAN, {
-    'class': '',
     'role' : 'tooltip',
     'type' : 'button'
   }, zoomOutTipLabel);