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HTML 

              
                !!!
%html{ ng: { app: 'rodeo' } }
    %head
        %script{ src: '//code.angularjs.org/1.2.14/angular.min.js' }
        %script{ src: '//rawgithub.com/ekg/fraction.js/master/fraction.js' }
        %script{ src: '//use.typekit.net/fce2hpf.js' }
    %body{ ng: { controller: 'book' } }
        .banner
            .recipe--author Chris Coyier's
            .recipe--title Four-Bean Chili
            .recipe--ingredient-preview.hidden-xs{ ng: { class: "{ '{{image}}': true, 'is-active': (image === ingredientImages[activeIngredient]) }", repeat: 'image in ingredientImages' } }
        .container-fluid
            %section.row.recipe--header
                .col-sm-6.col-xs-5
                    %span.rating.hidden-xs
                        %span.glyphicon.glyphicon-star
                        %span.glyphicon.glyphicon-star
                        %span.glyphicon.glyphicon-star
                        %span.glyphicon.glyphicon-star-empty
                    %span.glyphicon.glyphicon-time
                    1hr 20m
                .col-sm-6.col-xs-7
                    .recipe--servings
                        %input{ type: 'text', ng: { model: 'servings' } }
                        %span.glyphicon.glyphicon-cutlery
                    %span.glyphicon.glyphicon-minus{ ng: { click: 'downServing()' } }
                    %span.glyphicon.glyphicon-plus{ ng: { click: 'upServing()' } }
            %section.row.recipe--body
                .col-sm-6.col-sm-push-6
                    .row
                        .col-sm-10.col-sm-offset-2.col-xs-11.col-xs-offset-1
                            %h3 Ingredients
                            %ul
                                %li.recipe--ingredient{ ng: { repeat: 'ingredient in ingredients', click: 'toggleCheck($index)', class: "{ 'is-checked': ingredient.checked }" } }
                                    %span.glyphicon{ ng: { class: "{ 'glyphicon-unchecked': !ingredient.checked, 'glyphicon-check': ingredient.checked }" } }
                                    %span.recipe--amount{ ng: { if: 'ingredient.isWhole' } } {{ ingredient.amount }}
                                    %span.fraction{ ng: { if: 'ingredient.hasFraction' } }
                                        %sup {{ ingredient.fraction.numerator }}
                                        ⁄
                                        %sub {{ ingredient.fraction.denominator }}
                                    %span.recipe--unit {{ ingredient.unit }}
                                    %span {{ ingredient.name }}
                .col-sm-6.col-sm-pull-6
                    .row
                        .col-xs-11.col-xs-offset-1
                            %h3 Directions
                            %ol.recipe--directions
                                %li{ ng: { repeat: 'direction in directions', class: "{ 'is-completed': direction.isCompleted }", click: 'toggleDirection($index)' } }
                                    %span {{ direction.step }}
                                    %br
                                    .recipe--ingredient-preview{ ng: { repeat: 'image in direction.images', class: "{ '{{image}}': true, 'is-hidden': direction.isCompleted }" } }
            %footer.row
                .col-xs-6
                    Made in DC by
                    %a{ href: 'https://twitter.com/jan_rubio', target: '_blank'  } @jan_rubio
                .col-xs-6.rodeo
                    %a{ href: 'https://blog.codepen.io/rodeo/season-three', target: '_blank' }
                        CodePen Pattern Rodeo #9
!

CSS 

              
                $primary: #c0392b;

body {
  font-family: 'freight-sans-pro', 'Helvetica', sans-serif;
  text-rendering: optimizeLegibility;
}

sup {
  left: 2px;
  top: -6px;
}

sub {
  bottom: -2px;
  right: 3px;
}

.banner {
  background: url(https://3.bp.blogspot.com/-J612h0xyvWg/UUhvgwU8CAI/AAAAAAAANkw/d8014xHZnbU/s1600/chili+10.jpg) 0% 35% / cover;
  background: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAJ0lEQVQIW2NkQAP////3YUQWAwswMm6BC8IEQIrAgsgCYEF0AZAgANOYE0+1rVFfAAAAAElFTkSuQmCC), url(https://3.bp.blogspot.com/-J612h0xyvWg/UUhvgwU8CAI/AAAAAAAANkw/d8014xHZnbU/s1600/chili+10.jpg) 0% 35% / cover;
  height: 255px;
  position: relative;
  width: 100%;
  
  &:before {
    background: rgba(0, 0, 0, .2);
    content: '';
    display: block;
    height: 100%;
    position: absolute;
    top: 0;
    width: 100%;
  }
  
  &:hover {
    .recipe--title {
      animation: bounceOutUp .5s;
      animation-fill-mode: forwards;
    }
    
    .recipe--author {
      animation: fadeOut .3s;
      animation-fill-mode: forwards;
    }
    
    &:after {
      animation: fadeIn .5s;
      background: rgba(0,0,0,.5);
      box-sizing: border-box;
      color: #fff;
      content: 'My grandpappy used to make this chili over the campfire under the Texas stars. The secret ingredient was a little squeeze of scorpion venom in the pot.';
      display: block;
      font-size: 150%;
      height: 255px;
      position: absolute;
      top: 0;
      left: 0;
      padding: 90px calc(50% - 300px);
      text-align: center;
      z-index: 1;
    }
  }
}

.recipe--author {
  animation: fadeIn 2s;
  color: #fff;
  font-size: 18px;
  margin: 0 auto;
  position: relative;
  text-align: center;
  text-transform: uppercase;
  top: 75px;
  width: 135px;

  &:before, &:after {
    border-bottom: 4px double rgba(255, 255, 255, .75);
    content: "";
    height: 0;
    position: absolute;
    top: 12px;
    width: 50px;
  }
  
  &:before {
    right: 100%;
  }
  
  &:after {
    left: 100%;
  }
}

@mixin threedshadow($color, $depth) {
  $all: ();
  @for $i from 1 through $depth {
    $all: append($all, append($i*1px $i*1px 0, $color), comma);
  text-shadow: $all
  }
}

.recipe--title {
  animation: bounceInDown 1s;
  color: #fff;
  font-family: 'bello-pro', 'Helvetica', sans-serif;
  font-size: 50px;
  margin: 0 auto;
  position: relative;
  text-align: center;
  @include threedshadow($primary, 7);
  top: 70px;
  width: 100%;
}

.recipe--ingredient-preview {
  background: #fff;
  background-color: #fff;
  background-size: cover;
  border: 6px solid #FFF;
  border-radius: 50%;
  height: 125px;
  left: calc(50% - 62px);
  opacity: 0;
  position: absolute;
  top: 210px;
  transition: opacity 1.5s ease-out;
  width: 125px;
  z-index: 2;
  
  &.is-active {
    opacity: 1;
  }
  
  &.pot {
    background-image: url(https://3.bp.blogspot.com/-BiyfYGwD4es/UN87pRX2cDI/AAAAAAAAArI/evH8K26T4dQ/s1600/CB3.jpg);
    background-position: center right;
  }
  
  &.salt {
    background-image: url(https://dusyefwqqyfwe.cloudfront.net/uploads/recipe/ingredient/image/70/medium_square_maldon-salt.jpg);
  }

  &.tomatoes {
    background-image: url(https://dusyefwqqyfwe.cloudfront.net/uploads/recipe/ingredient/image/92/medium_square_veg-plum-tomatoes.jpg);
  }

  &.jalapeno {
    background-image: url(https://dusyefwqqyfwe.cloudfront.net/uploads/recipe/ingredient/image/41/medium_square_jalapeno.jpg);
  }

  &.pepper {
    background-image: url(https://dusyefwqqyfwe.cloudfront.net/uploads/recipe/ingredient/image/455/medium_square_cumin-test.jpg);
  }

  &.garlic {
    background-image: url(https://dusyefwqqyfwe.cloudfront.net/uploads/recipe/ingredient/image/2/medium_square_garlic-whole.jpg);
  }

  &.cayenne {
    background-image: url(https://dusyefwqqyfwe.cloudfront.net/uploads/recipe/ingredient/image/10/medium_square_paprika-bowl-test.jpg);
  }

  &.broth {
    background-image: url(https://dusyefwqqyfwe.cloudfront.net/uploads/recipe/ingredient/image/42/medium_square_chicken-base-6.jpg);
  }

  &.buffalo {
    background-image: url(https://dusyefwqqyfwe.cloudfront.net/uploads/recipe/ingredient/image/626/medium_square_meat-ground-beef.jpg);
  }

  &.onion {
    background-image: url(https://dusyefwqqyfwe.cloudfront.net/uploads/recipe/ingredient/image/27/medium_square_yellow-onion-test.jpg);
  }

  &.pinto-beans {
    background-image: url(https://4.bp.blogspot.com/-4iIHr5seqjs/UwOdX6pRqcI/AAAAAAAALWU/oPb8QMjtdn4/s1600/pinto+beans+3.jpg);
  }

  &.black-beans {
    background-image: url(http://img2.timeinc.net/health/images/slides/black-beans-challenge-400x400.jpg);
  }

  &.great-northern-beans {
    background-image: url(https://www.ifsbulk.com/content/images/thumbs/0000344_beans-great-northern.jpeg);
  }

  &.kidney-beans {
    background-image: url(http://www.luluhypermarket.com/admin/portal/food_guide/culinery_tip_image/1391688145.3488.jpg);
  }
  
  &.done {
    background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/3/chili.jpg);
  }
}

.recipe--header {
  background: $primary;
  color: #fff;
  font-size: 18px;
  padding: {
    bottom: 10px;
    top: 10px;
  };
  
  input {
    background: darken($primary, 5%);
    border-top: none;
    border-left: 0;
    border-right: 0;
    border-bottom: 0;
    color: #fff;
    margin: {
      left: 2px;
      right: 2px;
    }
    padding-bottom: 2px;
    text-align: center;
    width: 28px;
  }
  
  .recipe--servings {
    margin-right: 85px;
  }
  
  [class *= "col"]:nth-child(2) {
    [class *= "plus"] {
      right: 0px;
    }
    
    [class *= "minus"] {
      right: 40px;
    }
    
    [class *= "cutlery"] {
      border: 1px solid #FFF;
      border-radius: 50%;
      font-size: 13px;
      margin-right: -10px;
      padding: 6px;
    }
    
    > [class *= "glyphicon"] {
      border-left: 1px solid lighten($primary, 20%);
      cursor: pointer;
      font-size: 8px;
      padding: 20px 15px;
      position: absolute;
      top: -10px;
      transition: background .125s;
    
      &:hover {
        background: darken($primary, 5%);
      }
      &:active {
        background: lighten($primary, 5%);
      }
    }
  }
  
  [class *= "col"]:nth-child(2) {
    text-align: right;
  }
  
  .glyphicon-time {
    left: -5px;
    position: relative;
    top: 4px;
  }
}

.rating {
  float: right;
  position: relative;
  top: 2px;
  right: 60px;
}

.recipe--body {
  background: url(http://pcdn.paravel.netdna-cdn.com/wp-content/uploads/2012/02/paper.png);  
  
  h3 {
    margin-bottom: 25px;
  }
  
  > [class *= "col"]:nth-child(2) {
    background: #fefefe;
    margin-top: 35px;
    padding-bottom: 70px;
  }
  
  > [class *= "col"] {
    padding-top: 40px;
  }
}

.recipe--ingredient {
  cursor: pointer;
  padding: 5px 0;
  transition: color .1s linear;
  
  > .recipe--unit, > .recipe--amount {
    font-weight: 500;  
  }
  
  > .recipe--unit {
    margin-right: 5px;
  }
  
  .glyphicon {
    color: #d5d5d5;
    margin-right: 5px;
    position: relative;
    top: 2px;
  }
  
  &:hover:not(.is-checked) {
    color: $primary;
  }
  
  &.is-checked {
    color: #d5d5d5;
  }
}

.recipe--directions {
  counter-reset: item;
  list-style-type: decimal;

  > li {
    border-left: 1px dashed $primary;
    cursor: pointer;
    display: block;
    max-height: 160px;
    padding: 0 27px 28px 27px;
    transition: max-height .5s;
    > * {
      transition: opacity .25s;
    }
    
    &:hover {
      > * {
        opacity: .5;
      }
    }
    
    &.is-completed {
      max-height: 60px;
      border-left-style: solid;
      > * {
        opacity: .3;
        
        &.is-hidden {
          opacity: 0;
        }
      }
      
      &:before {
        background: $primary;
        color: #fff;
      }
    }
    
    &:last-child {
      border-left: 0;
      padding: {
        bottom: 0;
        top: 0;
      }
    }
    
    &:before {
      background: #FFF;
      border: 1px solid #C0392B;
      border-radius: 50%;
      color: $primary;
      content: counter(item) " ";
      counter-increment: item;
      display: inline-block;
      height: 25px;
      margin-left: -40px;
      text-align: center;
      width: 25px;
      margin-right: 11px;
    }
  }
  
  .recipe--ingredient-preview {
    display: inline-block;
    height: 50px;
    left: 0;
    position: relative;
    opacity: 1;
    top: 0;
    width: 50px;
  }
}

footer {
  background: $primary;
  color: #fff;
  padding: 10px 0;
  
  a {
    color: #fff;
    &:hover {
      color: #fff;
    }
  }
  
  .rodeo {
    text-align: right;
  }
}

@keyframes fadeIn {
  0% {
    opacity: 0;
  }
  
  50% {
    opacity: 0;
  }

  100% {
    opacity: 1;
  }
}

@keyframes fadeOut {
  0% {
    opacity: 1;
  }

  100% {
    opacity: 0;
  }
}

@keyframes bounceInDown {
  0% {
    opacity: 0;
    -webkit-transform: translateY(-500px);
    -ms-transform: translateY(-500px);
    transform: translateY(-500px);
  }

  60% {
    opacity: 1;
    -webkit-transform: translateY(30px);
    -ms-transform: translateY(30px);
    transform: translateY(30px);
  }

  80% {
    -webkit-transform: translateY(-10px);
    -ms-transform: translateY(-10px);
    transform: translateY(-10px);
  }

  100% {
    -webkit-transform: translateY(0);
    -ms-transform: translateY(0);
    transform: translateY(0);
  }
}

@keyframes bounceOutUp {
  0% {
    -webkit-transform: translateY(0);
    -ms-transform: translateY(0);
    transform: translateY(0);
  }

  100% {
    opacity: 0;
    -webkit-transform: translateY(-500px);
    -ms-transform: translateY(-500px);
    transform: translateY(-500px);
  }
}

@media (min-width: 768px) {  
  .recipe--body > [class *= "col"]:nth-child(2) {
      margin-top: 0;
  }
  
  .recipe--title {
    font-size: 75px;
  }
  
  .recipe--author {
    width: 135px;

    &:before, &:after {
      width: 135px;
    }
  }
}
!

JS 

              
                try{Typekit.load();}catch(e){}

angular.module('rodeo', []);
angular.module('rodeo')
  .controller('book', function ($scope, $interval) {

    $scope.servings = 4;
    
    $scope.ingredientImages = ['tomatoes', 'garlic', 'jalapeno','salt', 'pepper', 'buffalo', 'cayenne', 'broth', 'onion', 'pinto-beans', 'black-beans', 'great-northern-beans', 'kidney-beans'];
    
    $scope.directions = [
      { isCompleted: false, step: 'Get your filthiest campfire-scorched Dutch oven over the fire the best you can situate it.', images: ['pot'] },
      { isCompleted: false, step: 'Brown the bison.', images: ['buffalo'] },
      { isCompleted: false, step: 'Add the diced onion and spices, sautee until soft.', images: ['onion', 'jalapeno', 'garlic', 'salt', 'pepper', 'cayenne'] },
      { isCompleted: false, step: 'Add tomatoes and broth and bring to a simmer for 40 minutes.', images: ['tomatoes', 'broth'] },
      { isCompleted: false, step: 'Add beans and cook another 30 minutes.', images: ['pinto-beans', 'black-beans', 'great-northern-beans', 'kidney-beans'] },
      { isCompleted: false, step: 'Serve with Tabasco and a giant spoon.', images: ['done'] }
    ];
    
    $scope.toggleDirection = function (index) {
      $scope.directions[index].isCompleted = !$scope.directions[index].isCompleted;
    };
    
    $scope.$watch('directions', function () {
      if (_.all($scope.directions, 'isCompleted') && $scope.directions.length < 7) {
      $scope.directions.push({ isCompleted: false, step: 'Enjoy! Squeeze scorpion venom to taste.', images: [] });
      }
    }, true);
    
    $scope.activeIngredient = 0;
    
    $scope.isActiveIngredient = function (ingredient) {
      return ingredient === $scope.ingredientImages[$scope.activeIngredient];
    }
    
    $interval(function () {
      $scope.activeIngredient = ($scope.activeIngredient + 1) % $scope.ingredientImages.length;
    }, 1600);
    
    $scope.ingredients = [
      { base: .25, unit: 'lb', name: 'ground bison', checked: false },
      { base: .25, unit: 'cup', name: 'diced onion', checked: false },
      { base: 1, unit: '', name: 'diced jalepeños', checked: false },
      { base: .25, unit: 'cup', name: 'black beans', checked: false },
      { base: .25, unit: 'cup', name: 'great northern beans', checked: false },
      { base: .25, unit: 'cup', name: 'kidney beans', checked: false },
      { base: 1, unit: 'cloves', name: 'garlic', checked: false },
      { base: .5, unit: 'tbsp', name: 'mexican chili powder', checked: false },
      { base: .5, unit: 'tsp', name: 'salt', checked: false },
      { base: .5, unit: 'tsp', name: 'ground pepper', checked: false },
      { base: .25, unit: 'cup', name: 'cayenne', checked: false },
      { base: 7, unit: 'oz', name: 'crushed tomatoes', checked: false },
      { base: .75, unit: 'cups', name: 'beef broth', checked: false }
    ];
    
    $scope.upServing = function () {
      $scope.servings = _.parseInt($scope.servings) + 1;
    }
    
    $scope.downServing = function () {
      $scope.servings = Math.max(1, _.parseInt($scope.servings) - 1);
    }
    
    $scope.toggleCheck = function (index) {
      $scope.ingredients[index].checked = !$scope.ingredients[index].checked;
    }
      
    $scope.$watch('servings', function () {
      _.forEach($scope.ingredients, function (ingredient) {
        var fraction = null,
            author = 'rubiojan';
        ingredient.amount = ingredient.base * $scope.servings;
        fraction = ingredient.amount - Math.floor(ingredient.amount);
        
        if (fraction === 0) {
          ingredient.hasFraction = false;
          ingredient.fraction = {};
        } else {
          ingredient.hasFraction = true;
          fraction = new Fraction(fraction);
          ingredient.fraction = {
            numerator: fraction.numerator,
            denominator: fraction.denominator
          };
        }
        
        ingredient.isWhole = Math.floor(ingredient.amount) > 0;
        
        if (ingredient.isWhole && ingredient.hasFraction) {
          ingredient.amount = Math.floor(ingredient.amount);
        }
      });
    });
    
  });
!
999px

Console