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HTML

              
                //- Card Mixin
mixin card(type, number, date, id, active)
  if type == 'amex'
    - var image = 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/169963/Amex.png'
  else if type == 'discovery'
    - image = 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/169963/Discover.png'
  else if type == 'visa'
    - var image = 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/169963/Visa.png'
  else if type == 'mastercard'
    - var image = 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/169963/MC.png'
  
  .card(class=active ? 'active': '' 
        data-id='#{id}')
    img(src='#{image}')
    .number=number
    .expiration Valid Thru: #{date}

// Transaction Item
mixin transaction(title, category, ref, date, price, type)
  .transaction
    .icon-type: .icon(class='#{type}')
    .description
      .info
        h3=title
        span=category
        | 
        span=ref 
        |  - 
        span=date
      .price(class='#{type}')!=price

.wallet
  .overlay
    .card-form
      header
        h2 
          .type Visa
          span Card Details
        .a.close(href='#')
      .form
        .form-row
          .input-group
            label(for='') Name on card
            input(id='cardName'
                  type='text' 
                  value=''
                  placeholder='')
        .form-row
          .input-group
            label(for='') Card Number
            input(id='cardNumber'
                  type='text' 
                  value=''
                  maxlength='16'
                  placeholder='')
        .form-row
            .input-group
              label(for='') Expiry Date
              input(id='cardDate'
                    type='month'
                    value=''
                    placeholder='')
            .input-group
              label(for='') CVS
              input(id='cardCVS'
                    type='text'
                    value=''
                    maxlength='4'
                    placeholder='')
      footer.footer
        button.button Complete Payment

  .cards
    header
      h2 My Wallet
      a#add(href='#')
    .content
      +card('amex', '**** **** **** 1234', '2015-09', '1234', 't')
      +card('visa', '**** **** **** 7864', '2015-09', '7864', '')
      +card('mastercard', '**** **** **** 6542', '2015-09', '6542', '')
      +card('discovery', '**** **** **** 3125', '2015-09', '3125', '')

  .activity.active(data-id='1234')
    header
      h2 Balance
      span $735.
        i 00
    .content
      - for(var i = 0; i < 42; i++)
        if i % 2 === 0 
          +transaction('Apple iPhone 6, 16 GB', 'Electronics', '#4', '12 July, 2015', '$650.<i>00</i>', 'minus')
        else
          +transaction('Funds Added', 'Uncategorized', '#3', '11 July, 2015', '$900.<i>00</i>', 'plus')

  .activity(data-id='7864')
    header
      h2 Balance
      span $12033.
        i 00
    .content
      - for(var i = 0; i < 42; i++)
        if i % 2 === 0 
          +transaction('Apple iPhone 6, 16 GB', 'Electronics', '#4', '12 July, 2015', '$650.<i>00</i>', 'minus')
        else
          +transaction('Funds Added', 'Uncategorized', '#3', '11 July, 2015', '$900.<i>00</i>', 'plus')

  .activity(data-id='6542')
    header
      h2 Balance
      span $531.
        i 00
    .content
      - for(var i = 0; i < 42; i++)
        if i % 2 === 0 
          +transaction('Apple iPhone 6, 16 GB', 'Electronics', '#4', '12 July, 2015', '$650.<i>00</i>', 'minus')
        else
          +transaction('Funds Added', 'Uncategorized', '#3', '11 July, 2015', '$900.<i>00</i>', 'plus')

  .activity(data-id='3125')
    header
      h2 Balance
      span $4235.
        i 00
    .content
      - for(var i = 0; i < 2; i++)
        if i % 2 === 0 
          +transaction('Apple iPhone 6, 16 GB', 'Electronics', '#4', '12 July, 2015', '$650.<i>00</i>', 'minus')
        else
          +transaction('Funds Added', 'Uncategorized', '#3', '11 July, 2015', '$900.<i>00</i>', 'plus')
              
            
!

CSS

              
                $width: 880px;

$ultra: 800;
$bold: 700;
$semibold: 600;
$regular: 400;
$light: 300;
$thin: 100;

$white: #FFF;
$black: #000;
$dark-gray: rgba($black, .8);
$gray: rgba($black, .6);
$light-gray: rgba($black, .4);
$lighter-gray: rgba($black, .2);

$accent: lighten(#00A6EA, 15%);
$secondary: lighten(#E39C14, 15%);

body {
  background: #FECB6E;
  padding: 40px;
  color: $gray;
  font-family: 'Open Sans', sans-serif;
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection {
  background: $secondary;
}

.wallet {
  position: relative;
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
  background: $white;
  max-width: $width;
  border-radius: 6px;
  margin: 0 auto;
  
  // Causes bugs
  /* overflow: hidden; */
}

.content {
  height: 600px;
  overflow-y: auto;
  overflow-x: hidden;
}

.cards {
  background: #F2F2F2;
  flex-basis: 40%;
  width: 40%;
  height: 100%;
  box-sizing: border-box;
  padding: 60px;
  
  header {
    display: flex;
    justify-content: space-between;
    flex-wrap: nowrap;
    align-items: center;
    margin: 0 0 60px;
  }
  
  h2 {
    color: $gray;
    font-size: 24px;
  }
  
  .content {
    margin: 0 -60px;
    padding: 0 60px;
  }
}
  
#add {
  position: relative;
  width: 24px;
  height: 24px;
  padding: 10px;
  cursor: pointer;

  &:before,
  &:after {
    content: '';
    display: block;
    background: #C5CBE0;
    width: 24px;
    height: 4px;
    border-radius: 10px;
    margin: 10px 0 0;
  }

  &:after {
    margin: -4px 0 0;
    transform: rotate(90deg);
  }
}

.card {
  background: $white;
  width: 100%;
  border: 3px solid rgba($black, .1);
  border-radius: 4px;
  box-sizing: border-box;
  margin: 0 0 40px;
  padding: 20px;
  transition: .3s ease;
  filter: grayscale(1);
  cursor: pointer;
  
  &:last-child {
    margin: 0;
  }
  
  &.active {
    border-color: $accent;
    filter: grayscale(0);
  }
  
  img {
    display: block;
    height: 45px;
    margin: 0 0 20px;
  }
  
  .number {
    margin: 0 0 10px;
    color: $gray;
    font-size: 18px;
  }
  
  .expiration {
    color: $light-gray;
    font-size: 14px;
  }
}

// Activity
.activity {
  flex-basis: 60%;
  width: 60%;
  padding: 60px;
  box-sizing: border-box;

  header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid #F2F2F2;
    margin: 0 0 19px;
    padding: 0 0 40px;

    h2 {
      color: $gray;
      font-size: 24px;
      line-height: 44px;
    }

    span {
      display: inline-block;
      color: $dark-gray;
      font-size: 36px;
      font-weight: $bold;

      i {
        display: inline-block;
        font-size: 20px;
        vertical-align: top;
      }
    }
  }
}

// Transaction
.transaction {
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
  align-items: center;
  padding: 20px 0;
  
  .icon {
    display: block;
    width: 20px;
    height: 20px;
    border: 2px solid $light-gray;
    border-radius: 10px;
    box-sizing: border-box;
    margin: 0 20px 0 0;
    color: $dark-gray;
    font-size: 18px;
    font-weight: $bold;
    line-height: 16px;
    text-align: center;
    
    &.plus {
      &:before {
        content: '+';
      }
    }
    
    &.minus {
      line-height: 12px;

      &:before {
        content: '-';
      }
    }
  }
  
  .description {
    display: flex;
    justify-content: space-between;
    width: 100%;
    color: $light-gray;
  }
  
  h3 {
    display: block;
    width: 100%;
    margin: 0 0 10px;
    color: $dark-gray;
    font-size: 18px;
    font-weight: $semibold;
  }
  
  .price {
    font-size: 18px;
    font-weight: $semibold;
    
    &.plus {
      color: $secondary;
    }
    
    &.minus {
      color: $accent;
    }
    
    i {
      display: inline-block;
      font-size: 10px;
      vertical-align: top;
    }
  }
  
  &-empty {
    display: block;
    width: 100%;
    font-size: 14px;
    text-align: center;
  }
}

// Overlay
.overlay {
  z-index: 1;
  position: absolute;
  top: 0;
  left: 0;
  background: rgba($black, .8);
  width: 100%;
  height: 100%;
}

// Close Button
.close {
  @extend #add;
  position: absolute;
  top: 50%;
  right: 20px;
  border-radius: 100%;
  transform-origin: top;
  transform: rotate(45deg) translateY(-50%);
  transition: 0.3s ease;
  
  &:before,
  &:after {
    background: $white;
  }
  
  &:hover {
    background: $white;
    transform: rotate(225deg) translateY(-50%);
    
    &:before,
    &:after {
      background: $accent;
    }
  }
}

.card-form {
  z-index: 2;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: $white;
  width: 80%;
  border-radius: 4px;
  margin: auto;
  overflow: hidden;
  
  header {
    position: relative;
    background: $accent;
    
    h2 {
      padding: 20px;
      color: $white;
      font-size: 24px;
      font-weight: $bold;
      text-transform: uppercase;
    }
    
    input {
      outline: none;
      display: block;
      background: 0;
      border: 0;
      box-shadow: 0 2px 0 rgba($white, .4);
      margin: -5px 0 -4px;
      padding: 0;
      line-height: 1;
      color: $white;
      font-size: 24px;
      font-weight: $semibold;
      font-family: 'Open Sans';
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }
    
    span {
      display: block;
      margin: 10px 0 0;
      font-size: 14px;
    }
  }
  
  .footer {
    .button {
      outline: none;
      display: block;
      background: $accent;
      width: 100%;
      border: 0;
      padding: 20px 30px;
      color: $white;
      font-size: 14px;
      font-weight: $bold;
      text-transform: uppercase;
      cursor: pointer;
    }
  }
}


.form {
  padding: 20px;
  
  &-row {
    display: flex;
    flex-direction: row;
    margin: 0 0 30px;

    &:last-child {
      margin: 0;

      .input-group {
        width: 75%;
        margin: 0 15px 0 0;

        &:last-child {
          width: 25%;
          margin: 0 0 15px;
        }
      }
    }
  }

  .input-group {
    width: 100%;
  }

  label {
    display: block;
    width: 100%;
    margin: 0 0 10px;
    color: $accent;
    font-size: 12px;
    font-weight: $bold;
    text-transform: uppercase;
  }

  input {
    outline: none;
    display: block;
    background: rgba($black, .1);
    width: 100%;
    border: 0;
    border-radius: 4px;
    box-sizing: border-box;
    margin: 0;
    padding: 15px;
    color: $light-gray;
    font-size: 12px;
    font-weight: $bold;
  }
}
              
            
!

JS

              
                String.prototype.replaceAt = function(index, character) {
  return this.substr(0, index) + character + this.substr(index + character.length);
}

String.prototype.insert = function(index, string) {
  if (index > 0)
    return this.substring(0, index) + string + this.substring(index, this.length);
  else
    return string + this;
};

var typeValue,
  typeText,
  cardType,
  cardName,
  cardNumber,
  cardDate,
  cardId;

$('.overlay').hide();

$('#add').on('click', function(e) {
  e.preventDefault();
  $('.overlay').fadeIn(300);
});

$('.activity').not('.activity.active').hide();

function tabTrigger() {

  $('.card').click(function(e) {
    e.preventDefault();
    $('.card').removeClass('active');
    $(this).addClass('active');

    $('.activity').hide();
    $('.activity[data-id="' + $.attr(this, 'data-id') + '"').fadeIn();
  });
}

tabTrigger();

$('.card-form .button').on('click', function(e) {

  cardName = $('#cardName').val();
  cardNumber = $('#cardNumber').val();
  for (var i = 0; i < 12; i++) {
    cardNumber = cardNumber.replaceAt(i, "*");
  }
  cardDate = $('#cardDate').val();
  cardCVS = $('#cardCVS').val();

  if ($('.type-form').length) {
    alert('Please complete card type.');
  } else if (cardName == '') {
    alert('Card name appears to be empty.');
  } else if (cardNumber == '') {
    alert('Card number appears to be empty.');
  } else if (cardNumber.length != 16) {
    alert('Card number appears to be less then 16 characters.');
  } else if (cardDate == '') {
    alert('Card date appears to be empty.');
  } else if (cardCVS == '') {
    alert('Card CVS appears to be empty.');
  } else {
    for (var i = 1; i < 4; i++) {
      cardNumber = cardNumber.insert((5 * i) - 1, ' ');
    }

    cardType = $('.type').text();

    cardId = cardNumber.charAt(15);
    cardId += cardNumber.charAt(16);
    cardId += cardNumber.charAt(17);
    cardId += cardNumber.charAt(18);

    e.preventDefault();
    $('.overlay').fadeOut(300);

    $('.cards .content').append('<div class="card" data-id="' + cardId + '"><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/169963/' + cardType + '.png"/> <div class="number">' + cardNumber + '</div> <div class="expiration">Valid Thru: ' + cardDate + '</div> </div>');

    $('.wallet').append($('<div data-id="' + cardId + '" class="activity"> <header> <h2>Balance</h2><span>$0.<i>00</i></span> </header> <div class="content"> <div class="transaction transaction-empty">It seems you have no recent transactions.</div></div>').hide());

    tabTrigger();
    // Addin Account Balance

    $('.form input').val('');
  }
});

$('.close').on('click', function(e) {
  $('.overlay').fadeOut(300);
});

function typeChange() {
  typeText = $('.type').text();

  $('.type').on('click', function() {
    $(this).replaceWith('<input class="type-form" type="text" value="' + typeText + '" />')
  });
}

typeChange();

$(document).on('keydown', '.type-form', function(e) {
  if (e.keyCode == 13) {
    e.preventDefault();

    typeValue = $('.type-form').val();

    $('.type-form').replaceWith('<div class="type">' + typeValue + '</div>');

    typeChange();
  }
});
              
            
!
999px

Console