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The layout of the site does not display in the same way that are shown in the book.
Although the colours are showing correctly, the layout isn't showing the links in a sidebar.
I think I got the code right in the css files and the layout files concerned, and am at a loss why it is not showing correctly.
Bug caused by not renaming the application.css to application.css.scss
Thanks to Sam Ruby on the Pragmatic Books forum for showing me where I'd gone wrong.