Tyme, > 1. "0" values do not take a measurement. margin: 0; not margin:0px; A minor quibble: when a length value is zero, a unit-of-measurement identifier is optional, but still allowed [1]. For consistency, I personally use them even for zero values. James Aylard 1. http://www.w3.org/TR/REC-CSS2/syndata.html#length-units