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So then your css is e.g. on wrong place, or your template override it (template css are loaded as last and can override all the previous defined styles) So this needs to be found e.g. by some tool like firebug is.
Hi, then really no idea, if you set some css rule and it is on last position and it affects right class or id, then something needs to be wrong e.g. on PC or in browser. Try to check again if the css rule really applies to selected class or id (try to set other rules like background, etc. )