Migrating CSS to GWT 2.4

We are in the process of migrating from GWT 1.5.3 to 2.4. 

I have moved the gwt folder containing css files from public to war  folder. But as they were from 1.5.3 apparently some new definitions are missing. 

Where do I find the standard.css and other css files for GWT 2.4?

Thanks and appreciate any pointers.

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