CSS radial gradient as modal overlay background like Apple's -

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i couldn't seem right. want radial gradient overlay similar apple's, nothing doing seemed close. i'd center circle have 25% radius, settle 350px radius.

they this, yet i've seen newer versions user <canvas>. note ie or opera, need transparent png (not included in css code below)

html:

<html> <head>     <link rel="stylesheet" href="gogo.css" type="text/css" media="screen" title="no title" charset="utf-8"> </head> <body class=" bg"> <div class="radialbg"> heelo world </div> </body> </html>

css:

body {     margin: 0;     padding: 0; }  .bg {     background: url(pattern.jpeg) repeat; }  .radialbg {     background: transparent -webkit-gradient(radial, center center, 50, center center, 460, from(transparent), to(#000));     background: -moz-radial-gradient(circle, transparent, #000);     width: 100%;     height: 100%; }

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