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                <div class="card">

   <h2>Men's Harem Pants</h2>

   <div id="photo-viewer"></div>

   <div class="info">
      <p>Men's elephant pattern harem pants in black. Elastic band waist.</p>
         <li>Waist: 34" - 48"</li>
         <li>Length: 44"</li>

   <div class="actions">
      <a class="thumb" href="" >
         <img src="" />
      <a class="thumb" href="">
         <img src="" />
      <a class="thumb" href="">
         <img src="" />
      <button>Buy now</button>



                /* -------- LAYOUT ----------*/

* {
   box-sizing: border-box;

.card {
   display: block;
   width: 600px;
   margin: 80px auto;

h2 {
   margin-bottom: 20px;

div#photo-viewer {
   height: 300px;
   width: 300px;
   overflow: hidden;
   display: inline-block;
   position: relative;
} {
   width: 220px;
   height: 300px;
   display: inline-block;
   vertical-align: top;
   margin-left: 20px;

.thumb {
   margin-right: 8px;

.thumb img {
   height: 70px;

.actions button {
   float: right;
   margin-right: 4px;
   padding: 9px 15px;
   margin-top: 43px;

/* ------- COLOR, TYPOGRAPHY ------ */

body {
   font-size: 14px;
   font-family: 'Source Sans Pro', sans-serif;
   background-color: rgb(236, 214, 173);

.card {
   box-shadow: 2px 2px 15px rgb(167, 131, 131);
   background-color: white;
   padding: 25px;

h2 {
   font-size: 44px;
   font-family: 'Leckerli One', cursive;
   text-align: center;

/* the is-loading class is set/removed by JavaScript */ {
   content: url('');
   position: absolute;
   top: 0;
   right: 0;

#photo-viewer img {
   position: absolute;
   max-width: 100%;
   max-height: 100%;
   top: 50%;
   left: 50%;

.info {
   padding: 12px 0px 12px 12px;

.info strong {
   font-weight: bold;

.info p {
   margin-bottom: 7px;

.info li {
   list-style-type: square;
   list-style-position: inside;

.actions {
   padding-top: 10px;

a.thumb {
   text-decoration: none;

/* the active class is set/removed by JavaScript */ {
   opacity: 0.3;

.actions button {
   padding: 9px 15px;
   background-color: tomato;
   border: none;
   color: rgb(240,240,210);


// global variables
var lastRequested; //URL of the last image to be requested
var $currentImg; //current image being shown
var cache = {}; //empty cache object
var $frame = $('#photo-viewer'); //image frame div
var $thumbs = $('.thumb'); //the thumbnails links

// function to fade from the current image to a specified image
// pass in new image as parameter
function crossfade($newImg) {
   // if there is currently an image showing
   if($currentImg) {
      //stop its animation and fade it out
   // apply css to the new image
   // the stylesheet has positioned it to top: 50% and left: 50%
   // now we're moving it back up and back left the appropriate amount to center it
      //a negative margin of half its width
      marginLeft: (-$newImg.width()) / 2,
      //a negative margin of half its height
      marginTop: (-$newImg.height()) / 2
   // stop any animation and fade the new image in
   $newImg.stop().fadeTo('slow', 1);
   // update the global variable
   // the new image is now the currently shown image
   $currentImg = $newImg; 

// all the actions to take when a thumbnail is cliked

// when a thumbnail is clicked, run the anonymous function
$(document).on('click', '.thumb', function(e) {
   //local variable for new image
   var $newImg; 
   //"this" is the thumbnail anchor link
   //so local variable src holds the href of the clicked anchor link
   var src = this.href;
   //store as a global variable
   //the URL of the latest image to be requested
   lastRequested = src;
   //prevent the default link behavior
   //remove active class from all thumbnails
   //add active class to the thumnail that was clicked
   //if the cache object contains this src URL 
   if(cache.hasOwnProperty(src)) {
      //and if that image is not currently loading
      if(cache[src].isLoading === false) {
         //crossfade to the cached image
   } else { //otherwise it's not in the cache
      $img = $('<img/>'); //set $img to be an empty img element
      //store this image as an object in the cache, named by the URL
      cache[src] = {
         //store the empty img element
         $img: $img,
         // set isLoading property to true
         isLoading: true
   //specify what should happen WHEN the image has loaded (it's not yet)
   $img.on('load', function() {
      //hide the just-loaded image
      //remove the is-loading class from the image frame div
      //append the newly-loaded image to the frame div
      //now it's finished, so remove isLoading status in the cache
      cache[src].isLoading = false;
      //check that this is still the last requested image
      if(lastRequested === src) {
         //crossfade to this image
   //add the is-loading class to the frame div
   //set attributes on the img element
      'src': src, //set its src attribute to the URL
      'alt': this.title || '' //if the image has a title, add it to the alt attribute, otherwise set the attribute to be null

//once the script has loaded
//run this line to initiate the first image as the active one
//by simulating a click on it