<script src="https://app.wereserve.nl/widget/book/latest"></script>
<script>
  var config = {
    url: 'https://app.wereserve.nl/widget/book/259',
    urlMobile: 'https://app.wereserve.nl/m/reservate/259',
    ctaSelector: '#my-button' // CSS selector
  }
  wereserve.setupBookWidget(config)
</script>