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HTML 

              
                <h2>fancyBox v3.2 - Preview</h2>

<p>&nbsp;</p>

<div class="row">

  <div class="col-md-4">
    <form>

      <div class="form-group">
        <label for="animationEffect">Open/close animation type</label>
        <select id="animationEffect" class="form-control">
          <option value="zoom">zoom</option>
          <option value="fade">fade</option>
          <option value="slide">slide</option>
          <option value="rotate">rotate</option>
          <option value="circular">circular</option>
          <option value="tube">tube</option>
          <option value="zoom-in-out">zoom-in-out</option>
          <option value="" style="font-style:italic;color:#888;">none</option>
        </select>
      </div>

      <div class="form-group">
        <label for="transitionEffect">Transition effect between slides</label>
        <select id="transitionEffect" class="form-control">
          <option value="fade">fade</option>
          <option value="slide">slide</option>
          <option value="rotate">rotate</option>
          <option value="circular">circular</option>
          <option value="tube">tube</option>
          <option value="zoom-in-out">zoom-in-out</option>
          <option value="" style="font-style:italic;color:#888;">none</option>
        </select>
      </div>






      <div class="form-row mt-5">
        <div class="form-group col-md-3">
          Buttons
        </div>

        <div class="form-group col-md-9">


          <div class="form-check form-check-inline">
            <label class="form-check-label">
              <input class="form-check-input buttons" type="checkbox" value="slideShow" checked="checked"> SlideShow
            </label>
          </div>

          <div class="form-check form-check-inline">
            <label class="form-check-label">
              <input class="form-check-input buttons" type="checkbox" value="fullScreen" checked="checked"> Fullscreen
            </label>

          </div>
          <div class="form-check form-check-inline">
            <label class="form-check-label">
              <input class="form-check-input buttons" type="checkbox" value="thumbs" checked="checked"> Thumbnails
            </label>

          </div>
          <div class="form-check form-check-inline">
            <label class="form-check-label">
              <input class="form-check-input buttons" type="checkbox" value="download"> Download
            </label>
          </div>

          <div class="form-check form-check-inline">
            <label class="form-check-label">
              <input class="form-check-input buttons" type="checkbox" value="zoom"> Zoom
            </label>
          </div>
          
          <div class="form-check form-check-inline">
            <label class="form-check-label">
              <input class="form-check-input buttons" type="checkbox" value="share" checked="checked"> Share
            </label>
          </div>

          <div class="form-check form-check-inline">
            <label class="form-check-label">
              <input class="form-check-input buttons" type="checkbox" value="arrowLeft"> Left arrow
            </label>
          </div>
          
          <div class="form-check form-check-inline">
            <label class="form-check-label">
              <input class="form-check-input buttons" type="checkbox" value="arrowRight"> Right arrow
            </label>
          </div>
          
        </div>

      </div>


      <div class="form-row">
        <div class="form-group col-md-3">
          Display
        </div>

        <div class="form-group col-md-9">

          <div class="form-check form-check-inline">
            <label class="form-check-label">
              <input type="checkbox" class="form-check-input toggle" id="arrows" value="1" checked="checked"> 
              Navigation arrows
            </label>
          </div>

          <div class="form-check form-check-inline">
            <label class="form-check-label">
              <input type="checkbox" class="form-check-input toggle" id="infobar" value="1" checked="checked"> 
              Counter
            </label>
          </div>
          <div class="form-check form-check-inline">
            <label class="form-check-label">
              <input type="checkbox" class="form-check-input toggle" id="thumbs" value="1"> 
              Thumbnails
            </label>
          </div>
        </div>

      </div>

      <div class="form-row">
        <div class="form-group col-md-3">
          Language
        </div>

        <div class="form-group col-md-9">

          <div class="form-check form-check-inline">
            <label class="form-check-label">
              <input class="form-check-input" type="radio" name="lang" value="en" checked="checked"> English
            </label>
          </div>

          <div class="form-check form-check-inline">
            <label class="form-check-label">
              <input class="form-check-input" type="radio" name="lang" value="de"> German
            </label>
          </div>
        </div>
      </div>

      <div class="form-group">
        <button id="toggleClass" type="button" class="btn">Set custom class</button>
      </div>

    </form>

  </div>

  <div class="col-md-7">
    <p class="imglist">
      <a href="https://c1.staticflickr.com/9/8148/29324593462_abebaddc38_k.jpg" data-fancybox="images">
        <img src="https://c1.staticflickr.com/9/8148/29324593462_f890687b7a_m.jpg" />
      </a>

      <a href="https://c2.staticflickr.com/6/5499/30972532232_051e1dc57e_h.jpg" data-fancybox="images">
        <img src="https://c2.staticflickr.com/6/5499/30972532232_e9a298a0c5_m.jpg" />
      </a>

      <a href="https://farm1.staticflickr.com/560/31434966252_8e1bc946da_b_d.jpg" data-fancybox="images">
        <img src="https://farm1.staticflickr.com/560/31434966252_8e1bc946da_m_d.jpg">
      </a>

      <a href="https://c1.staticflickr.com/1/357/31876784275_12286240d4_h.jpg" data-fancybox="images">
        <img src="https://c1.staticflickr.com/1/357/31876784275_fbc9696913_m.jpg" />
      </a>

      <a href="https://farm1.staticflickr.com/582/32752534825_4b35b2df81_o_d.jpg" data-fancybox="images">
        <img src="https://farm1.staticflickr.com/582/32752534825_c25321a594_m_d.jpg" />
      </a>

      <a href="https://farm3.staticflickr.com/2859/33395734202_522f9d8efd_k_d.jpg" data-fancybox="images">
        <img src="https://farm3.staticflickr.com/2859/33395734202_15a81c4ef3_m_d.jpg" />
      </a>

      <a href="https://farm4.staticflickr.com/3953/15594397982_477385f90d_b_d.jpg" data-fancybox="images">
        <img src="https://farm4.staticflickr.com/3953/15594397982_477385f90d_m_d.jpg" />
      </a>
    </p>

  </div>

</div>
!

CSS 

              
                .myClass .fancybox-bg {
  background-color: #fff;
}

.myClass.fancybox-is-open .fancybox-bg {
  opacity: 1;
}

.myClass .fancybox-button,
.myClass .fancybox-navigation button {
  background: transparent;
  color: #444;
  padding: 8px;
}

.myClass .fancybox-button:hover:not([disabled]) {
	color: #000;
}

.myClass .fancybox-navigation button::before {
  background: transparent;
}

.myClass .fancybox-share {
  background: #fff;
}

.myClass .fancybox-close-small:after {
  font-size:25px;
}
!

JS 

              
                $("select").change(function() {
  var opt = $(this).attr("id");
  var val = $(this).val();

  $.fancybox.defaults[ opt ] = val === "" ? false : val;

  // Make "fade" transiton faster than others
  if ( opt === 'transitionEffect' ) {
    $.fancybox.defaults[ 'transitionDuration' ] = opt === 'fade' ? 330 : 550;
  }
});

$("input[type=radio][name=lang]").on("change", function() {
  $.fancybox.defaults.lang = $(this).val();
});

$(".toggle").change(function() {
  if ( this.id === 'thumbs' ) {
    $.fancybox.defaults.thumbs.autoStart = this.checked ? true : false;
  } else {
    $.fancybox.defaults[this.id] = this.checked ? true : false;
  }
});

$(".buttons").change(function() {
  var buttonArr = $('input:checkbox:checked.buttons').map(function () {
    return this.value;
  }).get();

  buttonArr.push('close');

  $.fancybox.defaults.buttons = buttonArr;
});

$("#toggleClass").on('click', function() {
  var setCustom = $.fancybox.defaults.baseClass === '';

  $.fancybox.defaults.baseClass = setCustom ? 'myClass' : '';

  $(this).html( setCustom ? 'Remove custom class' : 'Set custom class' );
});
!
999px

Console