If you run your code through Calibre's "Check Book" tool you should get the following error:
Quote:
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The font family name specified in the CSS @font-face rule: "marg" does not match the font name inside the actual font file: "AlexBrush". This can cause problems in some viewers. You should change the CSS font name to match the actual font name.
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Adding a few classes to an HTML element using spaces is the way to do it and is supported. I believe that if you fix the above error it should work.