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HTML 

              
                <div class="container">

  <!-- Gallery -->
  <div id="js-gallery" class="gallery">

    <!--Gallery Hero-->
    <div class="gallery__hero">
      <a href="" class="gallery__hero-enlarge ir" data-gallery="zoom">Zoom</a>

      <img src="https://public-619e3.firebaseapp.com/Product-Gallery/products/normal/product-01_view-01.jpg">
    </div>
    <!--Gallery Hero-->

    <!--Gallery Thumbs-->
    <div class="gallery__thumbs">
        <a href="https://public-619e3.firebaseapp.com/Product-Gallery/products/normal/product-01_view-01.jpg" data-gallery="thumb" class="is-active">
          <img src="https://public-619e3.firebaseapp.com/Product-Gallery/products/thumb/product-01_view-01.jpg">
        </a>
        <a href="https://public-619e3.firebaseapp.com/Product-Gallery/products/normal/product-01_view-02.jpg" data-gallery="thumb">
          <img src="https://public-619e3.firebaseapp.com/Product-Gallery/products/thumb/product-01_view-02.jpg">
        </a>
        <a href="https://public-619e3.firebaseapp.com/Product-Gallery/products/normal/product-01_view-03.jpg" data-gallery="thumb">
          <img src="https://public-619e3.firebaseapp.com/Product-Gallery/products/thumb/product-01_view-03.jpg">
        </a>
    </div>
    <!--Gallery Thumbs-->

  </div><!--.gallery-->
  <!-- Gallery -->
  
 </div><!--.container-->
!

CSS 

              
                /**
 * Variables
 */

// Spacing
$base-spacing: 1em;

// Colors
$off-white: #F5F5F5;
$base-accent-color: #34Bf49;

// Thumb Opacity Settings
$thumb-opacity-inactive: 0.75;
$thumb-opacity-hover: 1;
$thumb-opacity-active: 0.2;

// Icon Opacity Settings
$icon-opacity-norm: 0.5;
$icon-opacity-hover: 1;

// Transition Settings
$base-transition-timing: cubic-bezier(0.455,  0.030, 0.515, 0.955);
$base-transition-duration: .3s;


/**
 * Base Styles
 * 1. Improve box model
 * 2. Enable fluid images
 */

*,
*:before,
*:after {
  box-sizing: border-box; /* 1 */
}

body {
  background-color: $off-white;
}

img {
  max-width: 100%; /* 2 */
}


/**
 * Container Styles
 */

.container {
  max-width: 30em;
  margin: 0 auto;
  padding: 1em;
}


/**
 * Helper Styles
 */

// Image Replacement
.ir {
  text-indent: 100%;
  white-space: nowrap;
  overflow: hidden;
}


/**
 * Gallery Styles
 * 1. Enable fluid images
 */

.gallery {
  overflow: hidden;
}

.gallery__hero {
	overflow: hidden;
	position: relative;
  padding: $base-spacing*2;
  margin: 0 0 $base-spacing/3;
	background: #fff;

	// Modifiers
	.is-zoomed & {
    cursor: move;
		img {
			max-width: none;
			position: absolute;
			z-index: 0;
			top: -50%;
			left: -50%;
		}
	}
}

.gallery__hero-enlarge {
  position: absolute;
  right: $base-spacing/2;
  bottom: $base-spacing/2;
	z-index: 1;
  width: 30px;
  height: 30px;
  opacity: $icon-opacity-norm;
  background-image: url(data:image/svg+xml;base64,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);
  background-repeat: no-repeat;
  transition: opacity $base-transition-duration $base-transition-timing;
  
  &:hover {
    opacity: $icon-opacity-hover;
  }
  
  // Modifiers
  .is-zoomed & {
    background-image: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIzMCIgaGVpZ2h0PSIzMCIgdmlld0JveD0iNS4wIC0xMC4wIDEwMC4wIDEzNS4wIiBmaWxsPSIjMzRCZjQ5Ij48cGF0aCBkPSJNOTMuNTkzIDg2LjgxNkw3Ny4wNDUgNzAuMjY4YzUuNDEzLTYuODczIDguNjQyLTE1LjUyNiA4LjY0Mi0yNC45MTRDODUuNjg3IDIzLjEwNCA2Ny41OTMgNSA0NS4zNDMgNVM1IDIzLjEwNCA1IDQ1LjM1NGMwIDIyLjI0IDE4LjA5NCA0MC4zNDMgNDAuMzQzIDQwLjM0MyA5LjQgMCAxOC4wNjItMy4yNCAyNC45MjQtOC42NTNsMTYuNTUgMTYuNTZjLjkzNy45MjcgMi4xNjIgMS4zOTYgMy4zODggMS4zOTYgMS4yMjUgMCAyLjQ1LS40NyAzLjM5LTEuMzk2IDEuODc0LTEuODc1IDEuODc0LTQuOTEyLS4wMDItNi43ODh6TTE0LjU5IDQ1LjM1NGMwLTE2Ljk2NCAxMy44LTMwLjc2NCAzMC43NTMtMzAuNzY0IDE2Ljk2NCAwIDMwLjc1MyAxMy44IDMwLjc1MyAzMC43NjQgMCAxNi45NTQtMTMuNzkgMzAuNzUzLTMwLjc1MyAzMC43NTMtMTYuOTUzIDAtMzAuNzUzLTEzLjgtMzAuNzUzLTMwLjc1M3pNNTguNzcyIDQ5LjYxSDMxLjkyYy0yLjM1NSAwLTQuMjYzLTEuOTA3LTQuMjYzLTQuMjZzMS45MDgtNC4yNjMgNC4yNjItNC4yNjNINTguNzdjMi4zNTQgMCA0LjI2MiAxLjkwOCA0LjI2MiA0LjI2MnMtMS45MSA0LjI2LTQuMjYyIDQuMjZ6Ii8+PC9zdmc+); 
  }
}

.gallery__thumbs {
  text-align: center;
  background: #fff;
	a {
    display: inline-block;
		width: 20%;
    padding: $base-spacing/2;
    opacity: $thumb-opacity-inactive;
    transition: opacity $base-transition-duration $base-transition-timing;
    
    &:hover {
      opacity: $thumb-opacity-hover;
    }
    
    // Modifiers
    &.is-active {
      opacity: $thumb-opacity-active;
    }
	}
}
!

JS 

              
                var App = (function () {

  //=== Use Strict ===//
  'use strict';

  //=== Private Variables ===//
  var gallery = $('#js-gallery');

  //=== Gallery Object ===//
  var Gallery = {
    zoom: function(imgContainer, img) {
      var containerHeight = imgContainer.outerHeight(),
      src = img.attr('src');
      
      if ( src.indexOf('/products/normal/') != -1 ) {
        // Set height of container
        imgContainer.css( "height", containerHeight );
        
        // Switch hero image src with large version
        img.attr('src', src.replace('/products/normal/', '/products/zoom/') );
        
        // Add zoomed class to gallery container
        gallery.addClass('is-zoomed');
        
        // Enable image to be draggable
        img.draggable({
          drag: function( event, ui ) {
            ui.position.left = Math.min( 100, ui.position.left );
            ui.position.top = Math.min( 100, ui.position.top );
          }
        });
      } else {
        // Ensure height of container fits image
        imgContainer.css( "height", "auto" );
        
        // Switch hero image src with normal version
        img.attr('src', src.replace('/products/zoom/', '/products/normal/') );
        
        // Remove zoomed class to gallery container
        gallery.removeClass('is-zoomed');
      }
    },
    switch: function(trigger, imgContainer) {
      var src = trigger.attr('href'),
      thumbs = trigger.siblings(),
			img = trigger.parent().prev().children();
      
      // Add active class to thumb
      trigger.addClass('is-active');
      
      // Remove active class from thumbs
      thumbs.each(function() {
        if( $(this).hasClass('is-active') ) {
          $(this).removeClass('is-active');
        }
      });

      // Reset container if in zoom state
      if ( gallery.hasClass('is-zoomed') ) {
        gallery.removeClass('is-zoomed');
        imgContainer.css( "height", "auto" );
      }

      // Switch image source
      img.attr('src', src);
    }
  };

  //=== Public Methods ===//
  function init() {

    // Listen for clicks on anchors within gallery
    gallery.delegate('a', 'click', function(event) {
      var trigger = $(this);
      var triggerData = trigger.data("gallery");

      if ( triggerData === 'zoom') {
        var imgContainer = trigger.parent(),
        img = trigger.siblings();
        Gallery.zoom(imgContainer, img);
      } else if ( triggerData === 'thumb') {
        var imgContainer = trigger.parent().siblings();
        Gallery.switch(trigger, imgContainer);
      } else {
        return;
      }

      event.preventDefault();
    });

  }

  //=== Make Methods Public ===//
  return {
    init: init
  };

})();

App.init();
!
999px

Console