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copied!<h1>Specificity</h1> <p>Your issue is most likely regarding specificity. Chris Coyier has a great article on <a href="http://css-tricks.com/specifics-on-css-specificity/">CSS specificity</a>. I would also suggest you check out this handy <a href="http://specificity.keegan.st/">specificity calculator</a>.</p> <p>Using that calculator, we can see that <code>.table-striped > tbody > tr:nth-child(odd) > td</code> has a specificity of 23. As such, to override that, any new rule needs to have a specificity of something equal to or greater than 23. <code>.red</code> is at 10, so that isn't going to cut it.</p> <p>In this case, it should be as simple as matching the existing specificity, and then adding your class to it. <code>.table-striped > tbody > tr:nth-child(odd) > td.red</code> gives us a specificity of 33. As 33 is greater than 23, your rule should now work.</p> <p>See a working example here: <a href="http://bootply.com/91756">http://bootply.com/91756</a></p> <h1>!important</h1> <p>In general, you should never use <code>!important</code> unless you never want that rule to be overridden. <code>!important</code> is basically the nuclear option. I am moderately confident in saying that if you understand specificity, you should never need to <code>!important</code> to make a custom rule work properly in a framework like Bootstrap.</p> <h3>Update</h3> <p>After a bit of thought, the rule I provide here is probably a bit too specific. What happens if you want to higlight a cell on a table that isn't stripped? To make your rule a bit more global while still having enough specificity to work in stripped tables, I would go with <code>.table > tbody > tr > td.red</code>. This has the same specificity as the Bootstrap stripping, but will also work on tables that are not zebra stripped. Updated example is here: <a href="http://bootply.com/91760">http://bootply.com/91760</a></p>

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