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              <div class="container">
  <h1>Stack Bootstrap modals nicely</h1>
  
  <button class="btn btn-primary btn-lg" data-toggle="modal" data-target="#test-modal">Show Modal</button>

    <div class="modal fade" id="test-modal" data-modal-index="1">
  <div class="modal-dialog">
    <div class="modal-content">
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">&times;</span><span class="sr-only">Close</span></button>
        <h4 class="modal-title">Modal title 1</h4>
      </div>
      <div class="modal-body">
        <p>One fine body&hellip;</p>
             <button class="btn btn-default" data-toggle="modal" data-target="#test-modal-2">Launch Modal 2</button>
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
        <button type="button" class="btn btn-primary">Save changes</button>
      </div>
    </div><!-- /.modal-content -->
  </div><!-- /.modal-dialog -->
</div><!-- /.modal -->


    <div class="modal fade" id="test-modal-2" data-modal-index="2">
  <div class="modal-dialog">
    <div class="modal-content">
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">&times;</span><span class="sr-only">Close</span></button>
        <h4 class="modal-title">Modal title 2</h4>
      </div>
      <div class="modal-body">
        <p>One fine body&hellip;</p>
        <button class="btn btn-default" data-toggle="modal" data-target="#test-modal-3">Launch Modal 3</button>
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
        <button type="button" class="btn btn-primary">Save changes</button>
      </div>
    </div><!-- /.modal-content -->
  </div><!-- /.modal-dialog -->
</div><!-- /.modal -->

    <div class="modal fade" id="test-modal-3">
  <div class="modal-dialog">
    <div class="modal-content">
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">&times;</span><span class="sr-only">Close</span></button>
        <h4 class="modal-title">Modal title 3</h4>
      </div>
      <div class="modal-body">
        <p>One fine body&hellip;</p>
        
        <button class="btn btn-default" data-toggle="modal" data-target="#test-modal-4">Launch Modal 4</button>
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
        <button type="button" class="btn btn-primary">Save changes</button>
      </div>
    </div><!-- /.modal-content -->
  </div><!-- /.modal-dialog -->
</div><!-- /.modal -->


    <div class="modal fade" id="test-modal-4">
  <div class="modal-dialog">
    <div class="modal-content">
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">&times;</span><span class="sr-only">Close</span></button>
        <h4 class="modal-title">Modal title 4</h4>
      </div>
      <div class="modal-body">
        <p>One fine body&hellip;</p>
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
        <button type="button" class="btn btn-primary">Save changes</button>
      </div>
    </div><!-- /.modal-content -->
  </div><!-- /.modal-dialog -->
</div><!-- /.modal -->
</div>
            
          
!
            
              @import "lesshat";

@distance:40px; /* distance between stacked modals*/

@modal-translate-z: -340px; /* The first modal translateZ value*/

.transform(@translateZ) {
  -webkit-transform: scale(0.8) rotateY(45deg) translateZ(@translateZ);
  -ms-transform: scale(0.8) rotateY(45deg) translateZ(@translateZ);
  -o-transform: scale(0.8) rotateY(45deg) translateZ(@translateZ);
  transform: scale(0.8) rotateY(45deg) translateZ(@translateZ);
}

.preserve-3d(){
  -webkit-transform-style:preserve-3d;
  -ms-transform-style:preserve-3d;
  -o-transform-style:preserve-3d;
  transform-style:preserve-3d;
}

.perspective(@perspective){
  -webkit-perspective:@perspective;
  -moz-perspective:@perspective;
  -ms-perspective:@perspective;
  -o-perspective:@perspective;
  perspective:@perspective;
}
.container{
  margin:5em auto;
}

.modal.in{
  .perspective(2000px);
  
  .modal-dialog{
    &.aside{
      .transform(@modal-translate-z);
      .preserve-3d();
      
      &.aside-1{
        .transform(calc(@modal-translate-z + @distance));
      }
      &.aside-2{
        .transform(calc(@modal-translate-z + (@distance * 2)));
      }
      &.aside-3{
        .transform(calc(@modal-translate-z + (@distance * 3)));
      }
      &.aside-4{
        .transform(calc(@modal-translate-z + (@distance * 4)));
      }   
      &.aside-5{
        .transform(calc(@modal-translate-z + (@distance * 5)));
      }
    }
  }
}

            
          
!
            
              $('.btn[data-toggle=modal]').on('click', function(){
  var $btn = $(this);
  var currentDialog = $btn.closest('.modal-dialog'),
  targetDialog = $($btn.attr('data-target'));;
  if (!currentDialog.length)
    return;
  targetDialog.data('previous-dialog', currentDialog);
  currentDialog.addClass('aside');
  var stackedDialogCount = $('.modal.in .modal-dialog.aside').length;
  if (stackedDialogCount <= 5){
    currentDialog.addClass('aside-' + stackedDialogCount);
  }
});

$('.modal').on('hide.bs.modal', function(){
  var $dialog = $(this);  
  var previousDialog = $dialog.data('previous-dialog');
  if (previousDialog){
    previousDialog.removeClass('aside');
    $dialog.data('previous-dialog', undefined);
  }
});
            
          
!
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