CSS renders differently on web server than on development environment

Looks like you are comparing them in Internet Explorer 8. Microsoft introduced different rendering modes for local and Internet servers so that web developers would break down in tears.

If there’s no X-UA-Compatible value and site is in
Local Intranet security zone, it will be rendered
in EmulateIE7 mode by default.

Add X-UA-Compatible header or META to force full IE8 standards mode.

See also http://sharovatov.wordpress.com/2009/05/18/ie8-rendering-modes-theory-and-practice/

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