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HTML

              
                <h2>Bootstrap 3 Custom Modals Demo</h2>

<!-- Link triggered modal -->
<p><a href="#" 
      data-toggle="modal" 
      data-target="#customPositionModal">Click to open a Modal with custom positioning</a></p>
   
<!-- Button triggered modal -->
<p><button type="button" 
        class="btn btn-primary btn" 
        data-toggle="modal" 
        data-target="#customPositionModal">
  Click to open a Modal with custom positioning
  </button></p>

<hr>
<!-- Link triggered modal -->
<p><a href="#" 
      data-toggle="modal" 
      data-target="#customSizeModal">Click to open a custom-sized Modal</a></p>
   
<!-- Button triggered modal -->
<p><button type="button" 
        class="btn btn-success" 
        data-toggle="modal" 
        data-target="#customSizeModal">
  Click to open a custom-sized Modal
  </button></p>

<hr>
<!-- Link triggered modal -->
<p><a href="#" 
      data-toggle="modal" 
      data-target="#customHeaderModal"
      class="text-muted">Default</a>
   &nbsp;
   <a href="#" 
      data-toggle="modal" 
      data-target="#customHeaderModal"
      class="text-primary">Primary</a>
   &nbsp;
   <a href="#" 
      data-toggle="modal" 
      data-target="#customHeaderModal"
      class="text-success">Success</a>
   &nbsp;
   <a href="#" 
      data-toggle="modal" 
      data-target="#customHeaderModal"
      class="text-info">Info</a>
   &nbsp;
   <a href="#" 
      data-toggle="modal" 
      data-target="#customHeaderModal"
      class="text-warning">Warning</a>
   &nbsp;
   <a href="#" 
      data-toggle="modal" 
      data-target="#customHeaderModal"
      class="text-danger">Danger</a>
</p>

<!-- Button triggered modal -->
<p><button type="button" 
        class="btn btn-muted" 
        data-toggle="modal" 
        data-target="#customHeaderModal">
  Default
  </button>
  &nbsp;
  <button type="button" 
        class="btn btn-primary" 
        data-toggle="modal" 
        data-target="#customHeaderModal">
  Primary
  </button>
  &nbsp;
  <button type="button" 
        class="btn btn-success" 
        data-toggle="modal" 
        data-target="#customHeaderModal">
  Success
  </button>
  &nbsp;
  <button type="button" 
        class="btn btn-info" 
        data-toggle="modal" 
        data-target="#customHeaderModal">
  Info
  </button>
  &nbsp;
  <button type="button" 
        class="btn btn-warning" 
        data-toggle="modal" 
        data-target="#customHeaderModal">
  Warning
  </button>
  &nbsp;
  <button type="button" 
        class="btn btn-danger" 
        data-toggle="modal" 
        data-target="#customHeaderModal">
  Danger
  </button>
</p>

<!-- Modal DIVS -->
<div class="modal fade" id="customPositionModal" tabindex="-1" role="dialog" aria-labelledby="customPositionModal" aria-hidden="true">
    <div class="modal-dialog">
        <div class="modal-content">
            <div class="modal-header">
            <button type="button" class="close" data-dismiss="modal" aria-hidden="true">&times;</button>
            <h4 class="modal-title">Custom Positioned Modal</h4>
            </div>
            <div class="modal-body">
                <p>Hi, I'm a Modal with custom positioning of:</p>
                <pre>
#customPositionModal {
  top:5%;
  right:50%;
  outline: none;
}
                </pre>
            </div>
            <div class="modal-footer">
                <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
        </div>
    </div>
  </div>
</div>

<div class="modal fade" id="customSizeModal" tabindex="-1" role="dialog" aria-labelledby="customSizeModal" aria-hidden="true">
    <div class="modal-dialog">
        <div class="modal-content">
            <div class="modal-header">
            <button type="button" class="close" data-dismiss="modal" aria-hidden="true">&times;</button>
            <h4 class="modal-title">Custom Size Modal</h4>
            </div>
            <div class="modal-body">
              <p>Hi, I'm a custom-sized Modal with a width of <span id="width"></span>.</p>
            </div>
            <div class="modal-footer">
                <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
        </div>
    </div>
  </div>
</div>

<div class="modal fade" id="customHeaderModal" tabindex="-1"
    role="dialog" aria-labelledby="customHeaderModal" aria-hidden="true">
  <div class="modal-dialog">
      <div class="modal-content panel-default">
          <div class="modal-header panel-heading">
          <button type="button" class="close" data-dismiss="modal" aria-hidden="true">&times;</button>
          <h4 class="modal-title"></h4>
          </div>
          <div class="modal-body">
              <h3>Modal Body</h3>
          </div>
          <div class="modal-footer">
              <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
        </div>
    </div>
  </div>
</div>


<br/>
<br/>
<hr size="2" />
<p>If you find this demo useful, please consider <a href="https://paypal.me/RobertGravelle/1" target="_blank">donating $1 dollar</a> (secure PayPal link) for a coffee or purchasing one of my songs from <a href="http://ax.itunes.apple.com/WebObjects/MZSearch.woa/wa/search?term=rob%20gravelle" target="_blank">iTunes.com</a> or <a href="http://www.amazon.com/s/ref=ntt_srch_drd_B001ES9TTK?ie=UTF8&field-keywords=Rob%20Gravelle&index=digital-music&search-type=ss" target="_blank">Amazon.com</a> for only 0.99 cents each. </p>
<p>Rob uses and recommends <a href="http://www.mochahost.com/2425.html" target="_blank">MochaHost</a>, which provides Web Hosting for as low as $1.95 per month, as well as unlimited emails and disk space!</p>

              
            
!

CSS

              
                body { text-align: center; }

#customPositionModal {
  top:5%;
  right:50%;
  outline: none;
}

#customSizeModal .modal-dialog  { 
  width: 75%; 
}

pre {
  text-align: left;
}

@media screen and (min-width: 768px) {
	#customSizeModal .modal-dialog { 
    width: 50%; 
  }
}

a[data-target="#customHeaderModal"] {
  text-decoration: underline; 
} 

.panel-heading {
    border-top-left-radius: inherit; 
    border-top-right-radius: inherit;
}
              
            
!

JS

              
                jQuery.fn.extend({
  swapClass: function(oldClassRegex, newClass, animationSpeed) {
      animationSpeed = animationSpeed || 500;
      return this.removeClass(function(index, className) {
          return (className.match(oldClassRegex) || [])[0];
      }).addClass( newClass, animationSpeed );
  }
});

$('#customSizeModal').on('show.bs.modal', function() {
    var rules = document.styleSheets[1].rules || document.styleSheets[1].cssRules,
        mql   = window.matchMedia("screen and (min-width: 768px)"),
        width;
  
    for (var i=0; i<rules.length && !width; i++) {
      var rule = rules[i];
      if (  mql.matches === true
            &&  rule.parentRule 
            && rule.parentRule.type === CSSRule.MEDIA_RULE
          || mql.matches === false 
            && rule.type === CSSRule.STYLE_RULE
            && rule.selectorText == '#customSizeModal .modal-dialog') {
        width = rule.style.getPropertyValue("width");
      }
      else if (  mql.matches === true 
              && rule.type === CSSRule.MEDIA_RULE) {
        for (var j=0; j<rule.cssRules.length && !width; j++) {
          var mediaRule = rule.cssRules[j];
          if (mediaRule.selectorText == '#customSizeModal .modal-dialog') {
            width = mediaRule.style.getPropertyValue("width");
          }
        }
      }
    }
    $(this).find("#width").text(width);
});

$('#customHeaderModal').on('show.bs.modal', function(event) {
  var label = $(event.relatedTarget).text().trim();
  $(this).find('.modal-content')
         .swapClass(/\bpanel-\w+\b/, 
                    'panel-' + label.toLowerCase())
         .find('.modal-title').text(label + ' Header');
});
              
            
!
999px

Console