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HTML

              
                <div id="savings-calculator">
  <h1>Savings Calculator</h1>
  <p>Save Up to <strong>35%</strong> On Your Energy Bills!</p>
  <hr>
  <label>How Much is Your Energy Bill Each Month?</label>
  <div class="range-slider">
    <input type="range" id="energyBill" name="energyBill" min="50" max="700" value="50" step="10">
    <strong>$<span id="range-value">50</span></strong>
    <!--<select>
  <option>$10</option>
  <option>$20</option>
  <option>$30</option>
  <option>$40</option>
  <option>$50</option>
  <option>$60</option
</select>-->
  </div>

  <h3>You could save up to <span id="savingsYearly" class="two-digits">$204</span> per year!</h3>
  <p>Estimated Monthly Savings: <span id="savingsMonthly" class="two-digits">$17</span></p>
  <a class="btn" href="#">Start Saving Today!</a>
  <i class="disclaimer">*This is an estimate based on average savings of our customers. While your savings may vary, we're committed to help you find the most energy efficient solution possible for your home.</i>
</div>
              
            
!

CSS

              
                body {
  font-family: sans-serif;
  text-align: center;
  background: #f5f5f5;
}

#savingsYearly, #savingsMonthly {
  color: #4c9612;
}

#savingsMonthly {
  font-weight: 700;
}

#savingsYearly {
  display: block;
  font-size: 60px;
}

#energyBill {
  margin-top: 10px;
}

#savings-calculator {
  display: block;
  max-width: 400px;
  margin-left: auto;
  margin-right: auto;
  padding: 35px 20px;
  background: #fff;
  box-shadow: 0 8px 20px -3px rgba(0,0,0,0.3);
  margin-top: 30px;
  margin-bottom: 30px;
  border-radius: 6px;
  box-sizing: border-box;
}

hr {
  margin: 20px 0;
  background: #ddd;
  border: none;
  height: 1px;
}

img {
  width: 100%;
  max-width: 200px;
  margin:0;
}

h1 {
  margin-top: 0;
}

.btn {
  background-image: linear-gradient(to bottom,#009DDD,#0c65a7);
    font-size: 20px;
    font-weight: 300;
    color: #fff;
    display: inline-block;
    padding: 24px 20px;
    position: relative;
    text-decoration: none;
    border: solid 1px transparent;
    border-radius: 4px;
    min-width: 200px;
    -webkit-transition: all .1s ease-in-out;
    -moz-transition: all .1s ease-in-out;
    -ms-transition: all .1s ease-in-out;
    -o-transition: all .1s ease-in-out;
    transition: all .1s ease-in-out;
    width: 100%;
  cursor: pointer;
  box-sizing: border-box;
  display: inline-block;
}

label {
  margin-bottom: 10px!important;
  display: block;
}

#energyBill {
  width: 230px;
  max-width: 100%;
  -webkit-appearance: none;
  height: 15px;
  border-radius: 10px;
  background: #d3d3d3;
  outline: none;
  opacity: 1;
}
  
#energyBill::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 25px;
  height: 25px;
  background: white;
  cursor: pointer;
  border-radius: 50%;
  border: solid 8px #7AC142;
  border: solid 8px #4c9612;
  border: solid 8px #009DDD;
  border: solid 8px #0c65a7;
}

#energyBill::-moz-range-thumb {
  width: 25px;
  height: 25px;
  background: #7AC142;
  cursor: pointer;
}

i.disclaimer {
  margin-top: 10px;
  font-size: 9px;
  color: #999;
  line-height: 1.4em!important;
  display: block;
}
              
            
!

JS

              
                // Regex function plugin to add commas to numbers
$.fn.digits = function(){ 
  return this.each(function(){ 
    $(this).text( $(this).text().replace(/(\d)(?=(\d\d\d)+(?!\d))/g, "$1,") ); 
  })
}

function isNumber (o) {
  return ! isNaN (o-0);
}  

// Adjust range number when changed
$('input[type=range]').on('input', function () {

  // Get number of attendees in range slider
  var energyBill = $('#energyBill').val();

  // Insert number of attendees in span
  $('#range-value').text(energyBill);

  var energySavings = Math.trunc(energyBill * 0.35);
  var energySavingsYearly = Math.trunc(energySavings * 12);

  $('#savingsMonthly').text('$' + energySavings);
  $('#savingsYearly').text('$' + energySavingsYearly);
  
  // Add commas to number
  $('#range-value').digits();
  $('#savingsMonthly').digits();
  $('#savingsYearly').digits();
    
});

              
            
!
999px

Console