font-family: Lato, sans-serif;
color: rgba(0, 0, 0, 0.87);
background-color: #039be5;
<h1 class="title sans">Export.closePopup example</h1>
<button type="button" id="auto-export-button" class="btn">Close popup</button>
var closePopupBtn = document.getElementById('auto-export-button');
.then(function(dronedeployApi) {
closePopupBtn.addEventListener('click', function(event) {
dronedeployApi.Exporter.closePopup();