If this is really for *every* button, then you can use the gwt-Button CSS 
class name, that's automatically added by each button in the constructor. 
In a CssResource, make sure you have an "@external .gwt-Button;" line to 
selectively disable obfuscation for that class name.
That way, you only ever have to inject your CssResource *once* for your 
whole app.

If you need to keep things "per button", then instead of using the same 
*.css source in many CssResource (<ui:style> generates a CssResource), 
which will result in your styles duplicated for each *.ui.xml file (CSS 
class names would be obfuscated with different names), then create a 
CssResource interface with the @Source("MyStyle.css"), put it in a 
ClientBundle, GWT.create() and ensureInjected() it somewhere (e.g. in your 
onModuleLoad), and then use it in your *.ui.xml with a <ui:with> (see 
http://code.google.com/webtoolkit/doc/latest/DevGuideUiBinder.html#Using_an_external_resource
 ).

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