css - Centering a div to the middle of the web page? -

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i want make div positioned in middle-center part of web page. i'm attempting make pre-loader div should in middle-center part of web page , after page loads, div hidden. how can achieve such?

the div should centered horizontally , vertically.

to center div both hor , ver way:

markup

<div class="centered"></div>

css

.centered{     position:absolute;     width:100px;     height:100px;     left:50%;     top:50%;     margin-left:-50px;     margin-top:-50px; }

fiddle: http://jsfiddle.net/steweb/qsvaq/1/


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