I’ve copied all the code from here but instead of looking like the sample it looks like the below screenshot. Obviously I’m missing something fundamental but being completely green in Java, GXT, and web development I’m unsure where to start. Any pointers gratefully received. 
I’ve copied all the code from here but instead of looking like the sample
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Are you using GXT 2 or 3?
Check to ensure the gxt-all.css file is loading correctly. I’m assuming you copied the gxt resources in to your project, and you’re referencing their CSS file in your host/entry point page.