add pending class while waiting for a state change
diff --git a/web/ons-demo/css/skin.default.css b/web/ons-demo/css/skin.default.css
index 753fff3..13f3e40 100644
--- a/web/ons-demo/css/skin.default.css
+++ b/web/ons-demo/css/skin.default.css
@@ -268,3 +268,22 @@
 	fill: #6949D7;
 	background-color: #6949D7;
 }
+
+
+@-webkit-keyframes pending {
+	from {
+		opacity: 1.0;
+	}
+	to {
+		opacity: 0.5;
+	}
+}
+
+.pending {
+	-webkit-animation-name: pending;
+	-webkit-animation-duration: .5s;
+	-webkit-animation-direction: alternate;
+	-webkit-animation-timing-function: ease-in-out;
+	-webkit-animation-iteration-count: 10;
+}
+