layout - How to put a div in center of browser using CSS? -

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How to put both the browser vertically and horizontally by using CRS in the browser ?

HTML: 

  & Lt; Div id = "something" & gt; ... content ... & lt; / Div & gt;

CSS: 

  # some {status: absolute; Height: 200 pixels; Width: 400px; Margin: -100px 0-200px; Top: 50%; Left: 50%; }

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