don't use child index

app.js

@@ -24,7 +24,7 @@ const deleteItem = (event)=>{
 }
 
 const createNewItem = (event)=>{
-	const template = document.querySelector('template').content.children[0];
+	const template = document.querySelector('template').content.querySelector('li');
 	const newItem = template.cloneNode(true)
 	newItem.querySelector('.add').addEventListener('click',createNewItem); 
 	newItem.querySelector('.delete').addEventListener('click',deleteItem);