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HTML

              
                <div class="invoice-box">
  <table cellpadding="0" cellspacing="0">
    <tr class="top">
      <td colspan="4">
        <table>
          <tr>
            <td class="title">
              <img src="https://www.sparksuite.com/images/logo.png" style="width:100%; max-width:300px;">
            </td>

            <td>
              Invoice #: 123<br> Created: January 1, 2015<br> Due: February 1, 2015
            </td>
          </tr>
        </table>
      </td>
    </tr>

    <tr class="information">
      <td colspan="4">
        <table>
          <tr>
            <td>
              Sparksuite, Inc.<br> 12345 Sunny Road<br> Sunnyville, CA 12345
            </td>

            <td>
              Acme Corp.<br> John Doe<br> john@example.com
            </td>
          </tr>
        </table>
      </td>
    </tr>

    <tr class="heading">
      <td colspan="3">
        Payment Method
      </td>

      <td>
        Check #
      </td>
    </tr>

    <tr class="details">
      <td colspan="3">
        Check
      </td>

      <td>
        1000
      </td>
    </tr>

    <tr class="heading">
      <td>
        Item
      </td>

      <td>
        Unit Cost
      </td>

      <td>
        Quantity
      </td>

      <td>
        Price
      </td>
    </tr>

    <tr class="item">
      <td>
        <input value="Website design" />
      </td>

      <td>
        $<input type="number" value="300" />
      </td>

      <td>
        <input type="number" value="1" />
      </td>

      <td>
        $300.00
      </td>
    </tr>

    <tr class="item">
      <td>
        <input value="Hosting (3 months)" />
      </td>

      <td>
        $<input type="number" value="75" />
      </td>

      <td>
        <input type="number" value="1" />
      </td>

      <td>
        $75.00
      </td>
    </tr>

    <tr class="item">
      <td>
        <input value="Domain name (1 year)" />
      </td>

      <td>
        $<input type="number" value="10" />
      </td>

      <td>
        <input type="number" value="1" />
      </td>

      <td>
        $10.00
      </td>
    </tr>

    <tr>
      <td colspan="4">
        <button class="btn-add-row">Add row</button>
      </td>
    </tr>

    <tr class="total">
      <td colspan="3"></td>

      <td>
        Total: $385.00
      </td>
    </tr>
  </table>
</div>
              
            
!

CSS

              
                .invoice-box {
  max-width: 800px;
  margin: auto;
  padding: 30px;
  border: 1px solid #eee;
  box-shadow: 0 0 10px rgba(0, 0, 0, .15);
  font-size: 16px;
  line-height: 24px;
  font-family: 'Helvetica Neue', 'Helvetica', Helvetica, Arial, sans-serif;
  color: #555;
}

.invoice-box table {
  width: 100%;
  line-height: inherit;
  text-align: left;
}

.invoice-box table td {
  padding: 5px;
  vertical-align: top;
}

.invoice-box table tr td:nth-child(n+2) {
  text-align: right;
}

.invoice-box table tr.top table td {
  padding-bottom: 20px;
}

.invoice-box table tr.top table td.title {
  font-size: 45px;
  line-height: 45px;
  color: #333;
}

.invoice-box table tr.information table td {
  padding-bottom: 40px;
}

.invoice-box table tr.heading td {
  background: #eee;
  border-bottom: 1px solid #ddd;
  font-weight: bold;
}

.invoice-box table tr.details td {
  padding-bottom: 20px;
}

.invoice-box table tr.item td{
  border-bottom: 1px solid #eee;
}

.invoice-box table tr.item.last td {
  border-bottom: none;
}

.invoice-box table tr.item input {
  padding-left: 5px;
}

.invoice-box table tr.item td:first-child input {
  margin-left: -5px;
  width: 100%;
}

.invoice-box table tr.total td:nth-child(2) {
  border-top: 2px solid #eee;
  font-weight: bold;
}

.invoice-box input[type=number] {
  width: 60px;
}

@media only screen and (max-width: 600px) {
  .invoice-box table tr.top table td {
      width: 100%;
      display: block;
      text-align: center;
  }
  
  .invoice-box table tr.information table td {
      width: 100%;
      display: block;
      text-align: center;
  }
}

/** RTL **/
.rtl {
  direction: rtl;
  font-family: Tahoma, 'Helvetica Neue', 'Helvetica', Helvetica, Arial, sans-serif;
}

.rtl table {
  text-align: right;
}

.rtl table tr td:nth-child(2) {
  text-align: left;
}
              
            
!

JS

              
                $('table').on('mouseup keyup', 'input[type=number]', () => calculateTotals());

$('.btn-add-row').on('click', () => {
  const $lastRow = $('.item:last');
  const $newRow = $lastRow.clone();

  $newRow.find('input').val('');
  $newRow.find('td:last').text('$0.00');
  $newRow.insertAfter($lastRow);

  $newRow.find('input:first').focus();
});

function calculateTotals() {
  const subtotals = $('.item').map((idx, val) => calculateSubtotal(val)).get();
  const total = subtotals.reduce((a, v) => a + Number(v), 0);
  $('.total td:eq(1)').text(formatAsCurrency(total));
}

function calculateSubtotal(row) {
  const $row = $(row);
  const inputs = $row.find('input');
  const subtotal = inputs[1].value * inputs[2].value;

  $row.find('td:last').text(formatAsCurrency(subtotal));

  return subtotal;
}

function formatAsCurrency(amount) {
  return `$${Number(amount).toFixed(2)}`;
}
              
            
!
999px

Console