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CSS

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HTML 

              
                %ul.item-list
  %li.item
    %div.item__information
      %div.item__image
        %img(src="http://upload.wikimedia.org/wikipedia/pt/6/67/30_STM_-_Love_Lust_Faith_%2B_Dreams.jpeg")
      %div.item__body
        %h2.item__title Love, Lust, Faith and Dreams
        %p.item__description Love, Lust, Faith and Dreams is the fourth studio album from American rock band Thirty Seconds to Mars.
      %div.item__price.js-item-price(data-price="11.99") $11.99
    %div.item__interactions
      %p.item__quantity
        %a.js-item-increase(title="Add another copy") +
        %a.js-item-decrease.decrease--disabled(title="Remove a copy") -
        %span(data-quantity="1")
          %b 1
          copy
        at $11.99
      %a.item__remove.js-item-remove(title="Remove this item") &times;
  %li.item
    %div.item__information
      %div.item__image
        %img(src="http://upload.wikimedia.org/wikipedia/en/a/a7/Random_Access_Memories.jpg")
      %div.item__body
        %h2.item__title Random Access Memories
        %p.item__description Random Access Memories is the fourth studio album by French electronic music duo Daft Punk.
      %div.item__price.js-item-price(data-price="11.88") $11.88
    %div.item__interactions
      %p.item__quantity
        %a.js-item-increase(title="Add another copy") +
        %a.js-item-decrease.decrease--disabled(title="Remove a copy") -
        %span(data-quantity="1")
          %b 1
          copy
        at $11.88
      %a.item__remove.js-item-remove(title="Remove this item") &times;
  %li.item
    %div.item__information
      %div.item__image
        %img(src="https://s3.amazonaws.com/rapgenius/600px-The_Heist_Macklemore.jpeg")
      %div.item__body
        %h2.item__title The Heist
        %p.item__description The Heist is the debut studio album by American rapper Macklemore and producer Ryan Lewis.
      %div.item__price.js-item-price(data-price="8.99") $8.99
    %div.item__interactions
      %p.item__quantity
        %a.js-item-increase(title="Add another copy") +
        %a.js-item-decrease.decrease--disabled(title="Remove a copy") -
        %span(data-quantity="1")
          %b 1
          copy
        at $8.99
      %a.item__remove.js-item-remove(title="Remove this item") &times;
%div.summary.js-summary
  %ul.steps
    %li
      %b Subtotal:
      %span.sum.js-subtotal $32.86
    %li
      %b Taxes (5%):
      %span.sum.js-taxes $1.64
    %li
      %b Shipping:
      %span.sum.js-shipping $5.00
  %ul.checkout
    %li
      %b Total:
      %span.sum.js-total $39.50
    %li
      %a.button.js-checkout-button Checkout
%div.info
  %div.info__content
    :markdown
      Created by [Sacha Schmid](https://twitter.com/sachaschmid). This is my entry for this week's [CodePen Pattern Rodeo](https://blog.codepen.io/rodeo/season-two/#week-three). If you liked it, please consider voting for me by hearting this Pen on CodePen.
      
      Note: This Pen is best viewed on the [full page](https://codepen.io/sacha/full/DvmCk) or using the vertical editor layout (check the lower right corner in the editor.)
%div.modal-wrapper.js-modal-wrapper
  %div.modal
    %h2.modal__title &hearts;
    %p Seems like we've run out of stock just this moment. Here, take a cute GIF instead.
    %img(src="http://cutestuff.co/wp-content/uploads/2012/12/suprised_kitten.gif")
    %p.modal__info Click anywhere to dismiss.
!

CSS 

              
                @import "compass/css3";

/* ---------- Variables ---------- */

$width: 35em;
$summary-spacing: 1.5em;
$element-shadow: 0 1px 0 rgba(#000, 0.25);

/* ---------- Web Fonts ---------- */

@font-face {
  font-family: 'Source Sans Pro';
  font-style: normal;
  font-weight: 400;
  src: local('Source Sans Pro'), local('SourceSansPro-Regular'), url(http://themes.googleusercontent.com/static/fonts/sourcesanspro/v5/ODelI1aHBYDBqgeIAH2zlNHq-FFgoDNV3GTKpHwuvtI.woff) format('woff');
}

@font-face {
  font-family: 'Source Sans Pro';
  font-style: normal;
  font-weight: 700;
  src: local('Source Sans Pro Bold'), local('SourceSansPro-Bold'), url(http://themes.googleusercontent.com/static/fonts/sourcesanspro/v5/toadOcfmlt9b38dHJxOBGIqjGYJUyOXcBwUQbRaNH6c.woff) format('woff');
}

/* ---------- Mixins ---------- */

@mixin keyframes ($name) {
  @-webkit-keyframes $name { @content; }
  @-moz-keyframes $name { @content; }
  @-ms-keyframes $name { @content; }
  @keyframes $name { @content; }
}

@mixin animation ($value) {
  -webkit-animation: $value;
  -moz-animation: $value;
  -ms-animation: $value;
  animation: $value;
}

@mixin breakpoint ($breakpoint) {
  @if $breakpoint == medium {
    @media (min-width: 40em) { @content; }
  } @elseif $breakpoint == wide {
    @media (min-width: 50em) { @content; }
  }
}

/* ---------- Placeholder selectors ---------- */

%clearfix::after {
  content: "";
  display: table;
  clear: both;
}

/* ---------- Universal selectors ---------- */

* {
  @include box-sizing(border-box);
}

/* ---------- Elements ---------- */

body {
  margin: 3em 0;
  font: 100%/1.5 Source Sans Pro, sans-serif;
  background-color: #f0f0f0;
  overflow-y: scroll;
  overflow-x: hidden;
  
  @include breakpoint(wide) {
    font-size: 112.5%;
  }
}

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

/* ---------- Shared ---------- */

.item,
.modal,
.steps,
.checkout {
  background-color: #fff;
  border-radius: 3px;
  box-shadow: 0 1px 3px rgba(#000, 0.25);
}

.item__interactions a,
.button {
  @include transition(background-color 0.25s ease-in-out);
  text-align: center;
  border-radius: 3px;
  cursor: pointer;
}

.empty-hint,
.info__content {
  a {
    @include transition-property(color, border-bottom-color);
    @include transition-duration(0.25s);
    @include transition-timing-function(ease-in-out);
    color: #e66b1e;
    border-bottom: 1px solid transparent;
    text-decoration: none;
    cursor: pointer;
    
    &:focus,
    &:hover {
      color: lighten(#e66b1e, 5%);
      border-bottom-color: lighten(#e66b1e, 5%);
    }
      
    &:active {
      position: relative;
      top: 1px;
    }
  }
}

/* ---------- Items ---------- */

.item-list {
  @extend %clearfix;
  width: 80%;
  margin: 0 auto 1.5em;
  
  &.delayed {
    @include transition(max-height 0.4s ease-in-out);
  }
  
  @include breakpoint(medium) {
    width: $width;
  }
}

.item {
  @include transition-property(transform, opacity, margin-top);
  @include transition-duration(0.25s);
  @include transition-timing-function(ease-in-out);
  @include transition-delay(0, 0, 0.25s);
  @include transform(translate3d(0, 0, 0));
  width: 100%;
  margin-bottom: 1.5em;
  
  .item-list.appearing & {
    @include transform(translateX($width));
    opacity: 0;
  }
  
  .item-list.delayed & {
    &:nth-child(1) { @include transition-delay(0.25s); }
    &:nth-child(2) { @include transition-delay(0.3s); }
    &:nth-child(3) { @include transition-delay(0.35s); }
  }
}

.item--disappearing {
  @include transform(translateX($width));
  opacity: 0;
}

.empty-hint {
  @include transition-property(max-height, opacity);
  @include transition-duration(0.5s);
  @include transition-timing-function(ease-in-out);
  @include transition-delay(0);
  @include transform(translate3d(0, 0, 0));
  max-height: 0;
  text-align: center;
  opacity: 0;
  overflow: hidden;
  -webkit-backface-visibility: hidden;
  
  &.is-visible {
    max-height: 20em;
    opacity: 1;
  }
  
  p {
    margin: 1.5em;
    
    @include breakpoint(medium) {
      padding: 1em;
    }
  }
  
  a {
    font-weight: bold;
  }
}

.item__information {
  @include breakpoint(medium) {
    display: table;
  }
}

.item__image {
  padding: 1.5em;
  border-bottom: 1px solid rgba(#ddd, 0.35);
  vertical-align: middle;
  
  img {
    display: block;
    width: 60%;
    height: auto;
    margin: 0 auto;
    border-radius: 5px;
    box-shadow: $element-shadow;
    -webkit-backface-visibility: hidden;
  
    &:hover,
    &:focus {
      @include animation(tilt 0.25s ease-in-out);
    }
  }
  
  @include breakpoint(medium) {
    display: table-cell;
    width: 7em;
    padding: 0;
    border-right: 1px solid rgba(#ddd, 0.35);
    border-bottom: 0;
  }
}

.item__body {
  padding: 1.5em 1.5em 0.5em;
  
  @include breakpoint(medium) {
    display: table-cell;
    width: 23em;
    padding: 0.75em 1em;
    border-right: 1px solid rgba(#ddd, 0.35);
  }
}

.item__title {
  margin-top: 0;
  margin-bottom: 0.5rem;
  font-size: 1em;
}

.item__description {
  margin-top: 0;
  margin-bottom: 0;
  font-size: 0.9em;
}

.item__price {
  padding: 0 1.5em 1.5em;
  color: #eb894c;
  font-weight: bold;
  border-radius: 0 3px 3px 0;
  vertical-align: middle;
  
  @include breakpoint(medium) {
    display: table-cell;
    width: 5em;
    padding: 0;
    text-align: center;
    background-color: #fcfcfc;
  }
}

.item__interactions {
  @extend %clearfix;
  display: block;
  width: 100%;
  padding: 1.5em;
  color: #666;
  font-size: 0.8em;
  border-top: 1px solid rgba(#ddd, 0.35);
  
  span {
    margin-left: 0.5em;
  }

  a {
    @include background-image(linear-gradient(top, rgba(#fff, 0.6), rgba(#fff, 0)));
    @include transition-property(opacity, background-color);
    @include transform(translate3d(0, 0, 0));
    display: inline-block;
    width: 3em;
    padding: 0.5em;
    background-color: #eaeaea;
    
    &.decrease--disabled {
      opacity: 0.5;
      cursor: default;
    }
    
    &:not([class*="decrease--disabled"]):focus,
    &:not([class*="decrease--disabled"]):hover {
      background-color: lighten(#eaeaea, 2%);
    }
      
    &:not([class*="decrease--disabled"]):active {
      background-color: darken(#eaeaea, 2%);
    }
  }
  
  @include breakpoint(medium) {
    padding: 1em;
  }
}

.item__quantity {
  margin-top: 0;
  margin-bottom: 0;
  float: left;
}

.item__remove {
  float: right;
}

/* ---------- Summary ---------- */

.summary {
  @extend %clearfix;
  width: 80%;
  margin: 0 auto;
  
  @include breakpoint(medium) {
    width: $width;
  }
}

.steps,
.checkout {
  width: 100%;
  
  li {
    padding: 1em;
    border-bottom: 1px solid rgba(#ddd, 0.35);
    
    &:last-child {
      border-bottom: 0;
    }
  }
  
  @include breakpoint(medium) {
    float: left;
    width: ($width - $summary-spacing) / 2;
  }
}

.steps {
  margin-bottom: $summary-spacing;
  
  @include breakpoint(medium) {
    margin-right: $summary-spacing;
    margin-bottom: 0;
  }
}

.sum {
  float: right;
}

.button {
  @include background-image(linear-gradient(top, rgba(#fff, 0.2), rgba(#fff, 0)));
  display: block;
  padding: 1em;
  color: #fff;
  font-weight: bold;
  text-shadow: 0 -1px 0 rgba(#000, 0.35);
  background-color: #e66b1e;
  box-shadow: $element-shadow;
  
  &:hover,
  &:focus {
    background-color: lighten(#e66b1e, 5%);
  }
    
  &:active {
    background-color: darken(#e66b1e, 5%);
  }
}

/* ---------- Info ---------- */

.info {
  padding-top: 3em;
  margin-top: 3em;
  border-top: 1px solid rgba(#ddd, 0.35);
}

.info__content {
  width: 80%;
  margin: 0 auto;
  text-align: center;
  
  p {
    margin-top: 0;
    margin-bottom: 1.5em;
    
    &:last-child {
      margin-bottom: 0;
      color: #666;
    }
  }
  
  @include breakpoint(medium) {
    width: $width;
  }
}

/* ---------- Modal ---------- */

.modal-wrapper {
  @include transition(visibility 0s linear 0.25s, opacity 0.25s ease-in-out);
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
  text-align: center;
  background-color: rgba(#111, 0.7);
  opacity: 0;
  visibility: hidden;
  cursor: pointer;
  
  &.is-visible {
    visibility: visible;
    opacity: 1;
    @include transition-delay(0s);
  }
  
  &::before {
    content: "";
    display: inline-block;
    height: 100%;
    vertical-align: middle;
  }
}

.modal {
  @include transform(translateY(5em) scale(0.95));
  @include transition(transform 0.25s ease-in-out);
  display: inline-block;
  width: 70%;
  padding: 1.5em;
  vertical-align: middle;
  
  .modal-wrapper.is-visible & {
    @include transform(translateY(0) scale(1));
  }
  
  p {
    margin: 0;
  }
  
  img {
    max-width: 100%;
    margin: 1.5em 0;
  }
  
  @include breakpoint(medium) {
    width: 25em;
  }
}

.modal__title {
  margin-top: 0;
  margin-bottom: 0;
  color: darken(red, 10%);
  line-height: 2;
}

.modal__info {
  color: #666;
  font-size: 0.8em;
}

/* ---------- Keyframes ---------- */

@include keyframes(tilt) {
  50% { @include transform(rotate(-5deg)); }
}
!

JS 

              
                var subtotal = document.querySelector('.js-subtotal'),
    itemList = document.querySelector('.item-list'),
    priceFields = document.querySelectorAll('.item .js-item-price'),
    taxes = document.querySelector('.js-taxes'),
    shipping = document.querySelector('.js-shipping'),
    total = document.querySelector('.js-total'),
    checkoutButton = document.querySelector('.js-checkout-button'),
    modalWrapper = document.querySelector('.js-modal-wrapper'),
    initialList = itemList.innerHTML

function loop (which, callback) {
  var len = which.length
      
  while (len--) {
    callback(which[len], len)
  }
}

function handleCalculations () {
  var subTotalPrice = 0,
      taxesPrice = 0
      
  loop(priceFields, function (price) {
    subTotalPrice += +price.textContent.substr(1)
  })
      
  subTotalPrice = subTotalPrice.toFixed(2)
      
  taxesPrice = (subTotalPrice * 0.05).toFixed(2)
      
  subtotal.textContent = '$' + subTotalPrice
  taxes.textContent = '$' + taxesPrice
  shipping.textContent = subTotalPrice !== '0.00' ? '$5.00' : 'Free'
  
  total.textContent = '$' + ((+subTotalPrice) + (+taxesPrice) + (+subTotalPrice > 0 ? 5 : 0)).toFixed(2)
}

function changeQuantity (emitter, action) {
  var action = emitter.classList.contains('js-item-increase') ? 'increase' : 'decrease',
      quantityField = emitter.parentElement.querySelector('span'),
      quantity = +quantityField.getAttribute('data-quantity'),
      price
  
  if (action === 'increase') {
    emitter.nextElementSibling.classList.remove('decrease--disabled')
  } else if (action === 'decrease') {
    if (quantity === 2) {
      emitter.classList.add('decrease--disabled')
    } else if (quantity === 1) {
      return
    }
  }
  
  quantityField.innerHTML = '<b>' + (action === 'increase' ? ++quantity : --quantity) + '</b> ' + (quantity > 1 ? 'copies' : 'copy')
  quantityField.setAttribute('data-quantity', quantity)

  price = emitter.parentElement.parentElement.parentElement.querySelector('.js-item-price')

  price.textContent = '$' + (quantity * price.getAttribute('data-price')).toFixed(2)
      
  handleCalculations()
}

function removeItem (emitter) {
  var item = emitter.parentElement.parentElement,
      len = priceFields.length,
      marginBottom = len > 1 ? parseInt(getComputedStyle(item).marginBottom, 10) : 0
      
  item.classList.add('item--disappearing')
  item.style.marginTop = -(item.offsetHeight + marginBottom) + 'px'
  
  setTimeout(function () {
    itemList.removeChild(item)
    
    priceFields = document.querySelectorAll('.item .js-item-price')
      
    if (!priceFields.length) {
      itemList.innerHTML = '<li class="item empty-hint"><p>Bummer, you removed all items! Wanna <a class="js-restore-list">start over again</a>?</li>'
      itemList.firstElementChild.classList.add('is-visible')
    }
      
    handleCalculations()
  }, 500)
}

function restoreList () {
  itemList.firstElementChild.classList.remove('is-visible')
    
  setTimeout(function () {
    itemList.style.minHeight = itemList.offsetHeight + 'px'
    itemList.classList.add('appearing', 'delayed')
    itemList.innerHTML = initialList
    itemList.style.maxHeight = itemList.offsetHeight + 'px'
    itemList.classList.remove('appearing')
    priceFields = document.querySelectorAll('.item .js-item-price')
    handleCalculations()
  }, 500)
    
  setTimeout(function () {
    itemList.style.minHeight = 0
    itemList.style.maxHeight = 'none'
    itemList.classList.remove('delayed')
  }, 1500)
}

itemList.addEventListener('click', function (e) {
  var target = e.target,
      classList = target.classList
  
  if (classList.contains('js-item-increase') || classList.contains('js-item-decrease')) {
    changeQuantity(target)
  } else if (classList.contains('js-item-remove')) {
    removeItem(target)
  } else if (classList.contains('js-restore-list')) {
    restoreList()
  }
})

checkoutButton.addEventListener('click', function () {
  modalWrapper.classList.add('is-visible')
})

modalWrapper.addEventListener('click', function () {
  modalWrapper.classList.remove('is-visible')
})

setTimeout(function () {
  modalWrapper.style.display = 'block'
}, 250)
!
999px

Console