<div id="navbar">
		<input type="checkbox" name="activate-menu" id="activate-menu" />
		<label for="activate-menu">BOTON</label>
		<div class="menu">
				<ul class="list">
						<li class="option option2">OPCION 1</li>
						<li class="option option2">OPCION 2</li>
						<li class="option option2">OPCION 3</li>
						<li class="option option2">OPCION 4</li>
						<li class="option option2">OPCION 5</li>
				</ul>
		</div>
</div>

a {
	font-size: 24px;
	font-family: "helvetica" sans-serif;
	font-weight: 900;
	color: black;
	text-decoration: none;
}
.list {
	border: 1px red solid;
	width: 300px;
	height: 170px;
	overflow: hidden;
	font-size: 18px;
	font-family: "helvetica" sans-serif;
	font-weight: 600
}
ul {
	list-style: none;
}
li.option {
	position: relative;
	height: 30px;
	width: 300px;
	border-bottom: 3px black solid;
	line-height: 30px;					/*line-height centra el texto verticalmente cuando coincide con el height*/
	opacity: 0;
	left: 150px;
	transition: .3s;
}
#activate-menu:checked ~ .menu ul li.option:first-child {transition-delay: .0s;}
#activate-menu:checked ~ .menu ul li.option:nth-child(2) {transition-delay: .05s;}
#activate-menu:checked ~ .menu ul li.option:nth-child(3) {transition-delay: .1s;}
#activate-menu:checked ~ .menu ul li.option:nth-child(4) {transition-delay: .15s;}
#activate-menu:checked ~ .menu ul li.option:last-child {transition-delay: .2s;}

li.option:first-child {transition-delay: .2s;}
li.option:nth-child(2) {transition-delay: .15s;}
li.option:nth-child(3) {transition-delay: .1s;}
li.option:nth-child(4) {transition-delay: .05s;}
li.option:last-child {transition-delay: .0s;}
#activate-menu {
	display:none;
}
#activate-menu + label {
	cursor: pointer;
}
 #activate-menu:checked ~ .menu .list .option {
 opacity: 1;
 left: 0px;
}