Add CSS for Application

        
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
    
    <mx:Style>
        @namespace mx "http://www.adobe.com/2006/mxml";
        global 
        {
            fontFamily:'Arial';
            fontSize:12px;
            textDecoration: underline;
            fontWeight: bold;
            fontStyle: italic;
            backgroundColor: #66CC66;
        }
        mx|Application {
            textDecoration: underline;
            backgroundColor: #FFCCFF;         
            
        }
    </mx:Style>
    <mx:Panel title="This is a test"  width="261" height="178">
        <mx:Label text="This is a dummy text" />
    </mx:Panel>
    
</mx:Application>

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Add CSS for Application : CSS « Style « Flex

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