How to make modal dialog with blur background using Twitter Bootstrap?

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You need to alter the structure of your document first.
It should look something like this

<body>
   <div class="supreme-container">all your content goes here except for the modal</div>
   <div id="myModal" class="modal fade">This is your modal.</div>
</body>

And then in css 

body.modal-open .supreme-container{
    -webkit-filter: blur(1px);
    -moz-filter: blur(1px);
    -o-filter: blur(1px);
    -ms-filter: blur(1px);
    filter: blur(1px);
}

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