Overwrite Label font size with attribute
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical"> <mx:Style> @namespace mx "http://www.adobe.com/2006/mxml"; mx|Label { font-family: 'Arial'; font-size: 20px; font-weight: 'bold'; color: #FFFFFF; } </mx:Style> <mx:Label text="Hello Flex!" /> <mx:Label text="Hello Flex!" fontSize="12" /> </mx:Application>