Teacher, why is the div not centered after I give it a random width with margin:auto?-PHP Chinese Network Q&A

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Teacher, why is the div not centered after I give it a random width with margin:auto?

永～不～低～头 2018-12-21 10:37:40

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Master, why is the div not centered after I give it a random width with margin:auto?

永～不～低～头

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鸿运达2018-12-21 17:48:24 1 floor

<section style="width:100%; float:left;">
<div style="width:1000px; height:500px; background:#f00; margin:0 auto;"></div>
</section>

Is this so?

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