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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

HTML

            
              <div class="container">
	<button type="buton" id="add" title="Add an item">+</button>
	<h1 id="title">My Todo List</h1>

	<ul class="list" aria-describedby="title">
		<li>
			<input type="checkbox" name="todolist" id="item-1" aria-labelledby="item-label-1">
			<label for="item-1"></label>
			<span id="item-label-1" contenteditable="true">Your first task</span>
		</li>
		<li>
			<input type="checkbox" name="todolist" id="item-2" aria-labelledby="item-label-2">
			<label for="item-2"></label>
			<span id="item-label-2" contenteditable="true"></span>
		</li>
	</ul>

	<button type="button" id="reset">Reset the list</button>
</div>
            
          
!

CSS

            
              :root {
	--primary: #3d7e9a;
}

body {
	width: 370px;
	max-width: 100%;
	margin: 0 auto;
	font-family: Helvetica, Arial, sans-serif;
	background: #f5f9fa;
	color: #444;
}

h1 {
	margin-top: -40px;
	display: flex;
	align-items: center;
	color: var(--primary);
}

.container {
	margin: 40px 16px;
	padding: 32px 24px;
	background: white;
	box-shadow: 0 16px 16px -8px rgba(0, 0, 0, .1);
	border: 1px solid rgba(0,0,0,.025);
}

/*
 * Add button
 */
[id="add"] {
	position: sticky;
	top: 40px;
	width: 48px;
	height: 48px;
	margin-left: 100%;
	padding-bottom: 4px;
	border: 0;
	font-size: 1.5em;
	color: white;
	background: var(--primary);
	border-radius: 50%;
	transition: all .275s;
	cursor: pointer;
}

[id="add"]:hover,
[id="add"]:focus {
	background: #22586f;
	transform: translateY(-2px);
	box-shadow: 0 4px 8px -3px rgba(0,0,0,.6);
}

[id="add"]:active {
	transform: translateY(-1px);
	box-shadow: 0 2px 4px -3px rgba(0,0,0,.8);
}

/**
 * Reset button
 */
[id="reset"] {
	margin-top: 32px;
	background: none;
	padding: 0;
	border: 0;
	font-size: .875em;
	font-weight: bold;
	color: darksalmon;
	cursor: pointer;
	text-decoration: underline;
}

/**
 * THE LIST
 */
.list {
	display: flex;
	flex-direction: column;
	margin: 0;
	padding: 0;
	list-style: none;
}

.list li {
	position: relative;
	margin: 4px 0;
	padding: 13px 16px 5px;
	border-top: 1px solid rgba(0,0,0,.1);
	line-height: 1.55;
	background: white;
}

.list .done {
	padding: 4px 40px;
	margin: 0 -24px;
	border: 0;
	order: 100;
	background: #f5f9fa;
}

.list .done label::before,
.list .done label::after,
.list .done span {
	opacity: .5!important;
}

.list .first-done {
	margin-top: 40px;
}

.list .first-done:before {
	content: 'Things done';
	display: block;
	padding: 8px 0 16px;
	font-weight: bold;
	color: var(--primary);
}

.list span {
	padding: 5px 8px 3px;
	margin-top: -.1em;
	display: inline-block;
	vertical-align: top;
	width: calc(100% - 56px);
	min-height: 1.5em;
	transition: all .275s;
	border-radius: 8px;
}

.list span:empty {
	background: #EEE;
}

.list span:empty::before {
	content: 'Write something';
	opacity: .4;
}

.list span:focus {
	background: var(--primary);
	outline: none;
	color: #FFF;
}

/**
 * Checkbox styling
 * with feature support selector
 * @see: (EN) https://www.creativejuiz.fr/blog/en/tutorials/customize-checkbox-and-radio-button-with-css - (FR) 
 */
[type="checkbox"]:not(:checked), 
[type="checkbox"]:checked {
	position: absolute;
	left: 0;
	opacity: 0.01;
}

/* Preparing the label */
[type="checkbox"]:not(:checked) + label,
[type="checkbox"]:checked + label {
	position: relative;
	padding-left: 1.75em;
	font-size: 1.05em;
	line-height: 1.7;
	cursor: pointer; 
}

/* Box aspect */
[type="checkbox"]:not(:checked) + label:before,
[type="checkbox"]:checked + label:before {
	content: '';
	position: absolute;
	left: 0;
	top: -.25em;
	width: 1.4em;
	height: 1.4em;
	border: 1px solid #aaa;
	background: #FFF;
	border-radius: .2em;
	box-shadow: inset 0 1px 3px rgba(0,0,0, .1), 0 0 0 rgba(203, 34, 237, .2);
	transition: all .275s;
}

/* Check aspect */
[type="checkbox"]:not(:checked) + label:after,
[type="checkbox"]:checked + label:after {
	content: '✕';
	position: absolute;
	top: .35em;
	left: .18em;
	font-size: 1.6em;
	color: var(--primary);
	line-height: 0;
	transition: all .2s;
}

/* Unchecked aspect */
[type="checkbox"]:not(:checked) + label:after {
	opacity: 0;
	transform: scale(0) rotate(45deg);
}

/* Checked aspect */
[type="checkbox"]:checked + label:after {
	opacity: 1;
	transform: scale(1) rotate(0);
}

/* Accessibility focus */
[type="checkbox"]:checked:focus + label:before,
[type="checkbox"]:not(:checked):focus + label:before {
	box-shadow: inset 0 1px 3px rgba(0,0,0, .1), 0 0 0 6px rgba(34, 170, 247, .2);
}
            
          
!

JS

            
              /**
 * CodePen is buggy and doesn't get the LocalStorage data at the first load of JS :/
 */
const add   = document.getElementById('add'),
		reset = document.getElementById('reset');

var saveListData = function(event){
	if ( window.localStorage ) {
		var lis  = document.querySelectorAll('.list li'),
			data = {},
			i    = 0;

		lis.forEach(function(el){
			var item = {};
			item['status'] = el.querySelector('input').checked;
			item['content'] = el.querySelector('span').innerHTML;
			data[i] = item;
			i++;
		});

		localStorage.setItem('my-awesome-todolist', JSON.stringify(data) );
	}
}

/**
 * Add an Item into the list
 */
add.addEventListener('click', function(){
	var last = document.querySelector('.list li:last-child'),
		 num = last.querySelector('input').id.split('-')[1];

	var clone = last.cloneNode(true);

	num = parseInt(num) + 1;
	clone.querySelector('input').setAttribute('id', 'item-' + num );
	clone.querySelector('input').setAttribute('aria-labelledby', 'item-label-' + num );
	clone.querySelector('input').removeAttribute('checked');
	clone.querySelector('input').checked = false;

	clone.querySelector('label').setAttribute('for', 'item-' + num );
	clone.querySelector('span').setAttribute('id', 'item-label-' + num );
	clone.querySelector('span').innerHTML = '';

	clone.className = '';

	last.insertAdjacentElement('afterend', clone);

	document.getElementById( 'item-' + num ).scrollIntoView({
		behavior: 'smooth'
	});

	document.getElementById( 'item-label-' + num ).focus();
});

/**
 * Reset the list
 */
reset.addEventListener('click', function(){
	var clone = document.querySelector('.list li:last-child').cloneNode(true);

	clone.className = '';
	clone.querySelector('span').innerHTML = '';
	clone.querySelector('input').removeAttribute('checked');

	document.querySelector('.list').innerHTML = '';
	document.querySelector('.list').appendChild( clone );

	saveListData();
});

/**
 * Save the data into localStorage
 */
if ( window.localStorage ) {
	var changeItemStatus = function(event){
		var parent = event.target.parentNode,
			lis    = document.querySelectorAll('.list li'),
			fdone  = document.querySelector('.first-done');

		if ( fdone ) {
			fdone.classList.remove('first-done');
		}

		if ( parent.classList.contains('done') ) {
			parent.classList.remove('done');
		} else {
			parent.classList.add('done');
		}

		for ( let el of document.querySelectorAll('.done') ) {
			el.classList.add('first-done');
			break;
		};
	},
	firstDone = false;

	// If data exists, build the list
	if ( localStorage.getItem('my-awesome-todolist') ) {

		var data = JSON.parse( localStorage.getItem('my-awesome-todolist') ),
			 html = '';

		Object.keys(data).forEach(function(k){

			if ( data[k].status === true && firstDone ==! 'already' ) {
				firstDone = true;
			}

			console.log(firstDone);

			html += '<li' + ( data[k].status ? ' class="done' + ( firstDone === true ? ' first-done' : '' ) + '"' : '' ) + '><input type="checkbox" name="todolist" id="item-' + k + '" aria-labelledby="item-label-' + k + '"' + ( data[k].status ? ' checked="checked"' : '' ) + '><label for="item-' + k + '"></label><span id="item-label-' + k + '" contenteditable="true">' + data[k].content + '</span></li>';

			if ( firstDone !== 'already' ) {
				firstDone = firstDone === true ? 'already' : false;
			}
		});

		// Write the existing list.
		document.querySelector('.list').innerHTML = html;
	}

	// Delegation of blur and change events
	document.querySelector('.list').addEventListener('blur', saveListData, true);
	document.querySelector('.list').addEventListener('change', saveListData, true);

	// Delegation of change for ordering items
	document.querySelector('.list').addEventListener('change', changeItemStatus, true);
}
            
          
!
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