[Import] CSS to achieve absolute centering of variable height DIV_www.KnowSky.com_html/css_WEB-ITnose

Generally speaking, it is more convenient to center a DIV with a specified height vertically and horizontally, but it is a little more troublesome if the height is not determined. I tried it and achieved absolute centering through two auxiliary DIVs. Compatible with standard browsers such as IE and FF.

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