javascript - how to center div in middle of browser viewport like google -

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i have search website needs have search bar , logo centered vertically , horizontally in index page items on page.

what best , effective way implementing this

for css-only approach check out fiddle. http://jsfiddle.net/jeffrod/nfths/

it requires width , height of center box known. positions top left of box in middle , then, using margins, shifts center of box @ center of page.


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