In addition to what JSWolf said, if you're not using that span class="num" anywhere else I'd dumb it down and get rid of its nesting in the css and specify it as
span.num {
blah blah blah;
}
Otherwise if you are using it elsewhere just make it unique; e.g., span class="numheaders".
"Complicated" css like you're using is more likely to cause problems.
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