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Avoid using HTML tags in CSS selectors E.g. Prefer .o-modal {} over div.o-modal {} Always prefer using a class over HTML tags (with some exceptions like CSS resets) Don't use ids in selectors #header is overly specific compared to, for example .header and is much harder to override Read more about the headaches associated with IDs in CSS here. Don’t nest more than 3 levels deep Nesting selectors i
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