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CSS

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HTML 

              
                <ul class="row first">
            <li class="col-md-3 col-sm-6 col-xs-12">
                <img alt="Rocking the night away"  src="http://demo.michaelsoriano.com/images/photodune-174908-rocking-the-night-away-xs.jpg">
            </li>
            <li class="col-md-3 col-sm-6 col-xs-12">
                <img alt="Yellow sign"  src="http://demo.michaelsoriano.com/images/photodune-287182-blah-blah-blah-yellow-road-sign-xs.jpg">
            </li>
            <li class="col-md-3 col-sm-6 col-xs-12">
                <img alt="Colors"  src="http://demo.michaelsoriano.com/images/photodune-460760-colors-xs.jpg">
            </li>
            <li class="col-md-3 col-sm-6 col-xs-12">
                <img alt="Retro party"  src="http://demo.michaelsoriano.com/images/photodune-461673-retro-party-xs.jpg">
            </li>
            <li class="col-md-3 col-sm-6 col-xs-12">
                <img alt="Technology soup"  src="http://demo.michaelsoriano.com/images/photodune-514834-touchscreen-technology-xs.jpg">
            </li>
            <li class="col-md-3 col-sm-6 col-xs-12">
                <img alt="Legal docs"  src="http://demo.michaelsoriano.com/images/photodune-916206-legal-xs.jpg" data-bsp-large-src="http://demo.michaelsoriano.com/images/photodune-916206-legal-large.jpg">
            </li>
            <li class="col-md-3 col-sm-6 col-xs-12">
                <img alt="Nature shot"  src="http://demo.michaelsoriano.com/images/photodune-1062948-nature-xs.jpg">
            </li>
            <li class="col-md-3 col-sm-6 col-xs-12">
                <img alt="Kid with camera" src="http://demo.michaelsoriano.com/images/photodune-1471528-insant-camera-kid-xs.jpg" data-bsp-large-src="http://demo.michaelsoriano.com/images/photodune-1471528-insant-camera-kid-large.jpg">
            </li>
            <li class="col-md-3 col-sm-6 col-xs-12">
                <img alt="Relax and Chill" src="http://demo.michaelsoriano.com/images/photodune-2255072-relaxed-man-xs.jpg">
            </li>
            <li class="col-md-3 col-sm-6 col-xs-12">
                <img alt="Cool colors" src="http://demo.michaelsoriano.com/images/photodune-2360379-colors-xs.jpg">
            </li>
            <li class="col-md-3 col-sm-6 col-xs-12">
                <img alt="Jump over"  src="http://demo.michaelsoriano.com/images/photodune-2360571-jump-xs.jpg">
            </li>
            <li class="col-md-3 col-sm-6 col-xs-12">
                <img alt="Culture business" src="http://demo.michaelsoriano.com/images/photodune-2361384-culture-for-business-xs.jpg">
            </li>

      <li class="col-md-3 col-sm-6 col-xs-12">
          <img alt="Spaghetti bitch" src="http://demo.michaelsoriano.com/images/photodune-2441670-spaghetti-with-tuna-fish-and-parsley-s.jpg">
      </li>
      <li class="col-md-3 col-sm-6 col-xs-12">
          <img alt="Budget this"  src="http://demo.michaelsoriano.com/images/photodune-2943363-budget-xs.jpg">
      </li>
      <li class="col-md-3 col-sm-6 col-xs-12">
          <img alt="Street art"  src="http://demo.michaelsoriano.com/images/photodune-3444921-street-art-xs.jpg">
      </li>


      <li class="col-md-3 col-sm-6 col-xs-12">
          <img alt="Insurance and stuff"  src="http://demo.michaelsoriano.com/images/photodune-3552322-insurance-xs.jpg">
      </li>

      <li class="col-md-3 col-sm-6 col-xs-12">
          <img alt="Food Explosion"  src="http://demo.michaelsoriano.com/images/photodune-3807845-food-s.jpg">
      </li>
      <li class="col-md-3 col-sm-6 col-xs-12">
          <img alt="Office worker sad" src="http://demo.michaelsoriano.com/images/photodune-3835655-down-office-worker-xs.jpg">
      </li>

      <li class="col-md-3 col-sm-6 col-xs-12">
          <img alt="" src="http://demo.michaelsoriano.com/images/photodune-4619216-ui-control-knob-regulators-xs.jpg">
      </li>

      <li class="col-md-3 col-sm-6 col-xs-12">
          <img alt="Health" src="http://demo.michaelsoriano.com/images/photodune-5771958-health-xs.jpg">
      </li>
      <li class="col-md-3 col-sm-6 col-xs-12">
          <img  alt="Constant consecutuir" src="http://demo.michaelsoriano.com/images/photodune-268693-businesswoman-using-laptop-outdoors-xs.jpg"><!--no alt tag-->
      </li>
      <li class="col-md-3 col-sm-6 col-xs-12">
          <img alt="Search code" src="http://demo.michaelsoriano.com/images/photodune-352207-search-of-code-s.jpg">
      </li>

      <li class="col-md-3 col-sm-6 col-xs-12">
          <img alt="Pountac" src="http://demo.michaelsoriano.com/images/photodune-247190-secret-email-xs.jpg"><!--no alt tag, no text-->
      </li>
    <li class="col-md-3 col-sm-6 col-xs-12">
        <img alt="Budget again" src="http://demo.michaelsoriano.com/images/photodune-2943363-budget-xs.jpg">
    </li>
    <li class="col-md-3 col-sm-6 col-xs-12">
        <img alt="Some alt tag" src="http://demo.michaelsoriano.com/images/photodune-3444921-street-art-xs.jpg"><!--no alt-->
    </li>
    <li class="col-md-3 col-sm-6 col-xs-12">
        <img alt="Insurance boy"  src="http://demo.michaelsoriano.com/images/photodune-3552322-insurance-xs.jpg">
    </li>
    <li class="col-md-3 col-sm-6 col-xs-12">
        <img alt="Food service"  src="http://demo.michaelsoriano.com/images/photodune-3807845-food-s.jpg">
    </li>
    <li class="col-md-3 col-sm-6 col-xs-12">
        <img alt="Dopamine high"  src="http://demo.michaelsoriano.com/images/photodune-3835655-down-office-worker-xs.jpg">
    </li>

  </ul>
<div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
  <div class="modal-dialog">
    <div class="modal-content">
      <div class="modal-body">
      </div>
    </div><!-- /.modal-content -->
  </div><!-- /.modal-dialog -->
</div><!-- /.modal -->
!

CSS 

              
                ul {
  padding:0 0 0 0;
  margin:0 0 0 0;
  display:flex;
  flex-wrap: wrap;
}
ul li {
  list-style:none;
  margin-bottom:25px;
  background: whitesmoke;
}
ul li img {
  cursor: pointer;
  width: 100%;
}

.modal-body img {
  width: 100%;
}
!

JS 

              
                $(document).ready(function(){
   $('li img').on('click',function(){
        var src = $(this).attr('src');
        var img = '<img src="' + src + '" class="img-responsive"/>';
      
       //Start of new code
        var index = $(this).parent('li').index();
        var html = '';
        html += img;
        html += '<div style="height:25px;clear:both;display:block;">';
        html += '<a class="controls next" href="'+ (index+2) + '">next &raquo;</a>';
        html += '<a class="controls previous" href="' + (index) + '">&laquo; prev</a>';
        html += '</div>';
        //End of new code

        $('#myModal').modal();
        $('#myModal').on('shown.bs.modal', function(){
            $('#myModal .modal-body').html(html);
        });
        $('#myModal').on('hidden.bs.modal', function(){
            $('#myModal .modal-body').html('');
        });
   });
});

 $(document).on('click', 'a.controls', function(){
   //this is where we add our logic
   var index = $(this).attr('href');
   alert(index);
   var src = $('ul.row li:nth-child('+ index +') img').attr('src');
   $('.modal-body img').attr('src', src);
   var newPrevIndex = parseInt(index) - 1;
   var newNextIndex = parseInt(newPrevIndex) + 2;

   if($(this).hasClass('previous')){
     $(this).attr('href', newPrevIndex);
     $('a.next').attr('href', newNextIndex);
   }else{
     $(this).attr('href', newNextIndex);
     $('a.previous').attr('href', newPrevIndex);
   }
   return false;
 });
!
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