createUpdateFunctionAndAddItToButtonEvenListenerForModularVanillaJavaScriptBlog.js

function update() {
  for (let i = 0; i < boxes.length; i++) {
    boxStorage.appendChild(boxes[i]);
  }
}
// also update needs to be called when ever we create a new box
button.addEventListener('click', () => {
  addBox(boxName.value, boxColor.value, boxHeight.value, boxWidth.value);
  update(); // add this to event listener
  boxName.value = '';
});