http://stovoxeobzeebmcgomjymnk73vcarxkikwo26lvfbaxmxbtjbe7umnid.onion/questions/491052/minimum-and-maximum-value-of-z-index
(Although you should consider carefully whether you really, really need this many z indices…). Answered Feb 26, 2013 at 16:11 by Creshal 0 Votes As other answers state, there doesn't seem to be a humanly-practical limit for z-index--even if there may be a strict numerical one. Without viewing the other divs in the querent's HTML, another likely cause was lack of position declaration, which has zinged me as well.