Deleting Check Boxes When Clicked

I am working on a simple to do list app and I want to add a function that deletes checked items. Below is the code I have so far.

    function onReady() {
  const addToDoForm = document.getElementById('addToDoForm');
  const newToDoText = document.getElementById('newToDoText');
  const toDoList = document.getElementById('toDoList');

  addToDoForm.addEventListener('submit', () => {
    event.preventDefault();

    // get the text
    let title = newToDoText.value;

    // create a new li
    let newLi = document.createElement('li');

    // create a new input
    let checkbox = document.createElement('input');

    // set the input's type to checkbox
    checkbox.type = "checkbox";

    // set the title
    newLi.textContent = title;

    // attach the checkbox to the li
    newLi.appendChild(checkbox);

    // attach the li to the ul
    toDoList.appendChild(newLi);

    //empty the input
    newToDoText.value = '';
  });

}

var checkbox = document.querySelector("input[name=checkbox]");

checkbox.addEventListener( 'change', function() {
    if(this.checked) {
        // Checkbox is checked..
    } else {
        // Checkbox is not checked..
    }
});


window.onload = function() {
   onReady();
};

Before I added the var checkbox, items were added to list. Now no items appear on list. What am I missing?