Use the two files in this repo to create a theming test page like we did on Live Coding Happy Hour at 08:50.
The rough steps are:
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Create a new page.
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With your new page open in UI Builder, go to Menu > Developer > Open Page Definition.
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Paste the text from the Composition file into the Composition field and the text from the Layout model file into the Layout model field.
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Refresh UI Builder and you should have a page with many components on it.