Change background to background colour and more

Change background to background-color and made it more darker when you click on an icon.

Author: daniel4-scratch

style.css

@@ -16,5 +16,8 @@
 	height: 24px;
 }
 #formatter img:hover {
-	background: #e6e6e6;
+	background-color: #e6e6e6;
+}
+#formatter img:active {
+	background-color: grey;
 }