Cannot reproduce GWT Layout examples in official guide

I'm trying to reproduce some of the layout's used at the code.google.com/webtoolkit page, and it's partially working - I get the desired 开发者_开发百科layout in a strict box form, but their examples show nice rounded corners and padding between sections. Is that something I can simply turn on, or do I have to add CSS to do all that for myself? I was hoping I could just turn it on!

Yes, those rounded corners are optional - you have to create them on your own. Take a look at GWT Showcase to see all GWT elements and accompanying source and css.