<!-- Modal -->
<div id="myModal" class="modal fade" role="dialog">
  <div class="modal-dialog">

    <!-- Modal content-->
    <div class="modal-content">
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal">&times;</button>
        <h4 class="modal-title">Modal Header</h4>
      </div>
      <div class="modal-body">
        <p>Some text in the modal.</p>
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
      </div>
    </div>

  </div>
</div>

 <div class="supreme-container">all your content goes here except for the modal
<button type="button" class="btn btn-info btn-lg" data-toggle="modal" data-target="#myModal">Open Modal</button>
   <br />
   <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Pariatur ab, enim accusamus iste explicabo, laboriosam quaerat numquam amet odio libero animi maiores obcaecati cumque dicta voluptates dolores voluptatum dolorum non!</p>
   <br />
   <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Odit commodi illum magnam nihil rem quas aperiam esse aliquid minus doloremque fuga rerum obcaecati, numquam! Aut voluptatem laudantium quidem, magni dolores.</p>
</div>
   <div id="myModal" class="modal fade">This is your modal.</div>

body.modal-open .supreme-container{
    -webkit-filter: blur(1px);
    -moz-filter: blur(1px);
    -o-filter: blur(1px);
    -ms-filter: blur(1px);
    filter: blur(4px);
}