html,
body {
  display: flex;
  flex-direction: column;
  height: 100%;
}

// Add an event listener for the drill down event
window.onload = function() {
  document
    .getElementById("vis")
    .addEventListener("inmydata.drilldown", function (event) {
      // We'll just display the event details in an alert box
      alert(
        'The following drill down was pressed: \n' 
        + JSON.stringify(event.detail, null, 2));
    });
}