CSS auto horizontal margin with a bottom margin -

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CSS auto horizontal margin with a bottom margin -

i have div margin: 0 auto; , part works great. want give div bottom margin of 80px. i've tried margin: 0 auto 80px; , work fine in webkit browsers, not in ff. know how accomplish browsers?

what said (0 auto 80px) should work, regardless of browser unless old. i've done many times myself without error. think else going on here, know sounds silly maybe other selector you're not aware of? happens lot more 1 guess.

css margin

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