Re: CSS - borders won't display in firefox

By floating boxes 1, 2, and 3 - you have lifted them up out of the
normal page flow. So the containing wrapper has nothing inside of it
anymore to keep it open. Float the wrapper left to get your border back.

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Alec
Adobe Community Expert

Thanks. that did it! But by floating wrapper left it is not centered in
display. So, I floated box 1,2,3 left and 4 right and no float on wrapper just
auto margin left and right.

How come the only way I could get things centered was to float box 4 right??