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Check for CSS in the head of the HTML document. This will override your CSS if present. Another trick is to vaildate the CSS. Invalid CSS might be followed by some software, other software might ignore the rule, ADe often disregards the whole css if it is invalid. Effective CSS can be in the CSS Stylehseet in a aseparte file, in the head of each html document, inline stylesheets, or even local in your reader or other software marked with the !important clause overriding the css you think which is being used.
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