<!-- this script is provided by https://www.htmlfreecode.com coded by: Kerixa Inc. -->
<style>
@import url("https://fonts.googleapis.com/css2?family=Roboto&display=swap");
:root {
	--font-1: "Roboto", sans-serif;
}

body {
	background: linear-gradient(to bottom, #d22d36, #b24d65);
	background-size: 100%;
}

.container {
	display: block;
	margin: 0 auto;
	width: 100%;
	max-width: 500px;
	overflow: hidden;
}

.container h1 {
	color: white;
	text-align: center;
	text-decoration: underline;
	font-family: var(--font-1);
	margin: 20px 0px 5px 0px;
}

.container form {
	display: block;
	margin: 0 auto;
	text-align: center;
	background: white;
	padding: 20px 0px;
}

.container .todo-input {
	display: inline-block;
	font-size: 25px;
	border: none;
	outline: none;
}

.container .add {
	margin: 0px;
	background: #ccc;
	border: 5px solid #ccc;
	font-size: 25px;
}

.container .todo-container {
	background: white;
	margin: 20px 0;
	width: 100%;
	min-height: 300px;
	padding: 10px;
}

.container .todo-container li {
	display: block;
	width: 95%;
	text-decoration: none;
	border-bottom: 3px #ccc solid;
}


/* The container */

.checkbox {
	display: block;
	position: relative;
	padding-left: 5px;
	margin-bottom: 12px;
	cursor: pointer;
	font-size: 22px;
	-webkit-user-select: none;
	-moz-user-select: none;
	-ms-user-select: none;
	user-select: none;
}


/* Hide the browser's default checkbox */

.checkbox input {
	position: absolute;
	opacity: 0;
	cursor: pointer;
	height: 0;
	width: 0;
}


/* Create a custom checkbox */

.checkmark {
	position: absolute;
	top: 0;
	left: 0;
	height: 25px;
	width: 25px;
	border-radius: 50%;
	background-color: #eee;
}


/* On mouse-over, add a grey background color */

.checkbox:hover input~.checkmark {
	background-color: #ccc;
}


/* When the checkbox is checked, add a blue background */

.checkbox input:checked~.checkmark {
	background-color: #b24d65;
}


/* Create the checkmark/indicator (hidden when not checked) */

.checkmark:after {
	content: "";
	position: absolute;
	display: none;
}


/* Show the checkmark when checked */

.checkbox input:checked~.checkmark:after {
	display: block;
}


/* Style the checkmark/indicator */

.checkbox .checkmark:after {
	left: 9px;
	top: 5px;
	width: 5px;
	height: 10px;
	border: solid white;
	border-width: 0 3px 3px 0;
	-webkit-transform: rotate(45deg);
	-ms-transform: rotate(45deg);
	transform: rotate(45deg);
}

.container .todo-container li div {
	display: inline-block;
	font-size: 22px;
	padding: 0px 10px 10px 40px;
	margin: 0px;
	font-family: var(--font-1);
}
</style>
<div class="container">
  <h1>Todo List</h1>
  <form>
    <input type="text" class="todo-input" placeholder="enter a todo">
    <button type="button" class="add"> + ADD</button>
  </form>
  <div class="todo-container">
    <li class="todo-item">
      <label class="checkbox">
        <input type="checkbox">
        <span class="checkmark"></span>
      </label>
      <div>Terraform Mars</div>
    </li>
    <li class="todo-item">
      <label class="checkbox">
        <input type="checkbox">
        <span class="checkmark"></span>
      </label>
      <div>Clean Car</div>
    </li>
    <li class="todo-item">
      <label class="checkbox">
        <input type="checkbox" checked="checked">
        <span class="checkmark"></span>
      </label>
      <div>Go to the store</div>
    </li>
  </div>
</div>
<script>
let input = document.querySelector(".todo-input");
let add = document.querySelector(".add");

add.addEventListener("click", function () {
	let value = input.value;
	if (value != "") {
		addTodo(value);
	}
	input.value = "";
});

function addTodo(x) {
	let parent = document.querySelector(".todo-container");
	let kid = document.createElement("li");
	kid.classList.add("todo-item");
	kid.innerHTML = `
	<label class="checkbox">
	<input type="checkbox">
	<span class="checkmark"></span>
	</label>
	<div>${x}</div>`;
	parent.prepend(kid);
}
</script>
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