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HTML

              
                <html>
	<head>
        <!-- Content Type Meta tag -->
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        
        <!--Responsive Viewport Meta tag-->
        <meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">
        
        
		<title>Todo list app</title>
        
		<!-- Roboto font embed -->
		<link href="https://fonts.googleapis.com/css?family=Roboto:400,500,700" rel="stylesheet">

		<!-- Stylesheets -->
		<link rel="stylesheet" type="text/css" href="resources/css/reset.min.css">
		<link rel="stylesheet" type="text/css" href="resources/css/style.css">
	</head>
	<body>

		<header>
			<input type="text" placeholder="Enter an activity.." id="item">
			<button id="add">
				<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"viewBox="0 0 16 16" style="enable-background:new 0 0 16 16;" xml:space="preserve"><g><path class="fill" d="M16,8c0,0.5-0.5,1-1,1H9v6c0,0.5-0.5,1-1,1s-1-0.5-1-1V9H1C0.5,9,0,8.5,0,8s0.5-1,1-1h6V1c0-0.5,0.5-1,1-1s1,0.5,1,1v6h6C15.5,7,16,7.5,16,8z"/></g></svg>
			</button>
		</header>

		<div class="container">
			<!-- Uncompleted tasks -->
			<ul class="todo" id="todo"></ul>

			<!-- Completed tasks -->
			<ul class="todo" id="completed"></ul>
		</div>

		<!-- JavaScripts -->
		<script src="resources/js/main.js"></script>
	</body>
</html>

              
            
!

CSS

              
                @charset "UTF-8";

body {
  background: #f9f098;
  padding: 80px 0 0 0;
}

body, input, button {
  font-family: 'Roboto', sans-serif;
}

.noFill {
  fill: none;
}

header {
  width: 100%;
  height: 80px;

  position: fixed;
  padding: 15px;
  top: 0;
  left: 0;
  z-index: 5;

  background: #f91400;
  box-shadow: 0px 2px 4px rgba(44, 62, 80, 0.15);
  border-bottom-right-radius: 10px;
  border-bottom-left-radius: 10px;
}

header input {
  width: 100%;
  height: 50px;
  float: left;
  color: #fff;
  font-size: 15px;
  font-weight: 400;
  text-indent: 18px;
  padding: 0 60px 0 0;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 5px 25px 25px 5px;
  border: 0px;
  box-shadow: none;
  outline: none;

  -webkit-appearance: none;
  -moz-appearance: none;
}

header input::-webkit-input-placeholder {
  color: rgba(255, 255, 255, 0.75);
}

header input:-moz-input-placeholder {
  color: rgba(255, 255, 255, 0.75);
}

header input::-moz-input-placeholder {
  color: rgba(255, 255, 255, 0.75);
}

header input:-ms-input-placeholder {
  color: rgba(255, 255, 255, 0.75);
}

header button {
  width: 50px;
  height: 50px;

  position:absolute;
  top:15px;
  right:15px;
  z-index:2;

  border-radius: 25px;
  background: #353535;
  border: 0px;
  box-shadow: none;
  outline: none;
  cursor: pointer;

  -webkit-appearance: none;
  -moz-appearance: none;
}

header button svg {
  width: 16px;
  height: 16px;

  position: absolute;
  top: 50%;
  left: 50%;

  margin: -8px 0 0 -8px;
}

header button svg .fill {
  fill: #ff0000;
}

.container {
  width: 100%;
  float: left;
  padding: 15px;
}

ul.todo {
  width: 100%;
  float: left;
}

ul.todo li {
  width: 100%;
  min-height: 50px;
  float: left;
  font-size: 14px;
  font-weight: 500;
  color: #444;
  line-height: 22px;
  list-style: none;

  background: #fff;
  border-radius: 5px;
  position: relative;
  box-shadow: 0px 1px 2px rgba(44, 62, 80, 0.10);
  margin: 0 0 10px 0;
  padding: 14px 100px 14px 14px;
  word-break: break-word;
}

ul.todo li:last-of-type {
  margin: 0;
}

ul.todo li .buttons {
  width: 100px;
  height: 50px;

  position: absolute;
  top: 0;
  right: 0;
}

ul.todo li .buttons button {
  width: 50px;
  height: 50px;
  float: left;
  background: none;
  position: relative;
  border: 0px;
  box-shadow: none;
  outline: none;
  cursor: pointer;

  -webkit-appearance: none;
  -moz-appearance: none;
}

ul.todo li .buttons button:last-of-type:before {
  content: '';
  width: 1px;
  height: 30px;
  background: #edf0f1;

  position: absolute;
  top: 10px;
  left: 0;
}

ul.todo li .buttons button svg {
  width: 22px;
  height: 22px;

  position: absolute;
  top: 50%;
  left: 50%;

  margin: -11px 0 0 -11px;
}

ul.todo li .buttons button.complete svg {
  border-radius: 11px;
  border: 1.5px solid #0011ff;

  transition: background 0.2s ease;
}

ul.todo#completed li .buttons button.complete svg {
  background: #0011ff;
  border: 0px;
}

ul.todo:not(#completed) li .buttons button.complete:hover svg {
  background: #0011ff;
}

ul.todo:not(#completed) li .buttons button.complete:hover svg .fill {
  fill: #fff;
}

ul.todo#completed li .buttons button.complete svg .fill {
  fill: #fff;
}

ul.todo li .buttons button svg .fill {
  transition: fill 0.2s ease;
}

ul.todo li .buttons button.remove svg .fill {
  fill: #c0cecb;
}

ul.todo li .buttons button.remove:hover svg .fill {
  fill: #e85656;
}

ul.todo li .buttons button.complete svg .fill {
  fill: #25b99a;
}

ul.todo#completed {
  position: relative;
  padding: 60px 0 0 0;
}

ul.todo#completed:before {
  content: '';
  width: 150px;
  height: 1px;
  background: #d8e5e0;

  position: absolute;
  top: 30px;
  left: 50%;

  margin: 0 0 0 -75px;
}

ul.todo#todo:empty:after {
  content: 'You have nothing to-do!';
  margin: 15px 0 0 0;
}

ul.todo#completed:empty:after {
  content: 'You have yet to complete any tasks.';
}

ul.todo#todo:after,
ul.todo#completed:after {
  width: 100%;
  display: block;
  text-align: center;
  font-size: 12px;
  color: #aaa;
}

              
            
!

JS

              
                var data = (localStorage.getItem('todoList')) ? JSON.parse(localStorage.getItem('todoList')):{
  todo: [],
  completed: []
};

// Remove and complete icons in SVG format
var removeSVG = '<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" viewBox="0 0 22 22" style="enable-background:new 0 0 22 22;" xml:space="preserve"><rect class="noFill" width="22" height="22"/><g><g><path class="fill" d="M16.1,3.6h-1.9V3.3c0-1.3-1-2.3-2.3-2.3h-1.7C8.9,1,7.8,2,7.8,3.3v0.2H5.9c-1.3,0-2.3,1-2.3,2.3v1.3c0,0.5,0.4,0.9,0.9,1v10.5c0,1.3,1,2.3,2.3,2.3h8.5c1.3,0,2.3-1,2.3-2.3V8.2c0.5-0.1,0.9-0.5,0.9-1V5.9C18.4,4.6,17.4,3.6,16.1,3.6z M9.1,3.3c0-0.6,0.5-1.1,1.1-1.1h1.7c0.6,0,1.1,0.5,1.1,1.1v0.2H9.1V3.3z M16.3,18.7c0,0.6-0.5,1.1-1.1,1.1H6.7c-0.6,0-1.1-0.5-1.1-1.1V8.2h10.6V18.7z M17.2,7H4.8V5.9c0-0.6,0.5-1.1,1.1-1.1h10.2c0.6,0,1.1,0.5,1.1,1.1V7z"/></g><g><g><path class="fill" d="M11,18c-0.4,0-0.6-0.3-0.6-0.6v-6.8c0-0.4,0.3-0.6,0.6-0.6s0.6,0.3,0.6,0.6v6.8C11.6,17.7,11.4,18,11,18z"/></g><g><path class="fill" d="M8,18c-0.4,0-0.6-0.3-0.6-0.6v-6.8c0-0.4,0.3-0.6,0.6-0.6c0.4,0,0.6,0.3,0.6,0.6v6.8C8.7,17.7,8.4,18,8,18z"/></g><g><path class="fill" d="M14,18c-0.4,0-0.6-0.3-0.6-0.6v-6.8c0-0.4,0.3-0.6,0.6-0.6c0.4,0,0.6,0.3,0.6,0.6v6.8C14.6,17.7,14.3,18,14,18z"/></g></g></g></svg>';
var completeSVG = '<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" viewBox="0 0 22 22" style="enable-background:new 0 0 22 22;" xml:space="preserve"><rect y="0" class="noFill" width="22" height="22"/><g><path class="fill" d="M9.7,14.4L9.7,14.4c-0.2,0-0.4-0.1-0.5-0.2l-2.7-2.7c-0.3-0.3-0.3-0.8,0-1.1s0.8-0.3,1.1,0l2.1,2.1l4.8-4.8c0.3-0.3,0.8-0.3,1.1,0s0.3,0.8,0,1.1l-5.3,5.3C10.1,14.3,9.9,14.4,9.7,14.4z"/></g></svg>';

renderTodoList();

// User clicked on the add button
// If there is any text inside the item field, add that text to the todo list
document.getElementById('add').addEventListener('click', function() {
  var value = document.getElementById('item').value;
  if (value) {
    addItem(value);
  }
});

document.getElementById('item').addEventListener('keydown', function (e) {
  var value = this.value;
  if (e.code === 'Enter' && value) {
    addItem(value);
  }
});

function addItem (value) {
  addItemToDOM(value);
  document.getElementById('item').value = '';

  data.todo.push(value);
  dataObjectUpdated();
}

function renderTodoList() {
  if (!data.todo.length && !data.completed.length) return;

  for (var i = 0; i < data.todo.length; i++) {
    var value = data.todo[i];
    addItemToDOM(value);
  }

  for (var j = 0; j < data.completed.length; j++) {
    var value = data.completed[j];
    addItemToDOM(value, true);
  }
}

function dataObjectUpdated() {
  localStorage.setItem('todoList', JSON.stringify(data));
}

function removeItem() {
  var item = this.parentNode.parentNode;
  var parent = item.parentNode;
  var id = parent.id;
  var value = item.innerText;

  if (id === 'todo') {
    data.todo.splice(data.todo.indexOf(value), 1);
  } else {
    data.completed.splice(data.completed.indexOf(value), 1);
  }
  dataObjectUpdated();

  parent.removeChild(item);
}

function completeItem() {
  var item = this.parentNode.parentNode;
  var parent = item.parentNode;
  var id = parent.id;
  var value = item.innerText;

  if (id === 'todo') {
    data.todo.splice(data.todo.indexOf(value), 1);
    data.completed.push(value);
  } else {
    data.completed.splice(data.completed.indexOf(value), 1);
    data.todo.push(value);
  }
  dataObjectUpdated();

  // Check if the item should be added to the completed list or to re-added to the todo list
  var target = (id === 'todo') ? document.getElementById('completed'):document.getElementById('todo');

  parent.removeChild(item);
  target.insertBefore(item, target.childNodes[0]);
}

// Adds a new item to the todo list
function addItemToDOM(text, completed) {
  var list = (completed) ? document.getElementById('completed'):document.getElementById('todo');

  var item = document.createElement('li');
  item.innerText = text;

  var buttons = document.createElement('div');
  buttons.classList.add('buttons');

  var remove = document.createElement('button');
  remove.classList.add('remove');
  remove.innerHTML = removeSVG;

  // Add click event for removing the item
  remove.addEventListener('click', removeItem);

  var complete = document.createElement('button');
  complete.classList.add('complete');
  complete.innerHTML = completeSVG;

  // Add click event for completing the item
  complete.addEventListener('click', completeItem);

  buttons.appendChild(remove);
  buttons.appendChild(complete);
  item.appendChild(buttons);

  list.insertBefore(item, list.childNodes[0]);
}


              
            
!
999px

Console