budget-calculator-4.js

// Polymer template code
<!-- A permanently visible (although empty) anchor, so we have somewhere to scroll to -->
<div id="results-anchor"></div>

// Polymer JavaScript code
const scrollToElement = (element, offset = 0) => {
  const distanceFromTop = element.getBoundingClientRect().top;
  window.scrollBy({
    top: distanceFromTop + offset,
    left: 0,
    behavior: 'smooth',
  });
};

// ...

showData: function(data) {
  // ...
  scrollToElement(this.$$('#results-anchor'), -40);
  // ...
}