<div class="demo">
	<div class="menu-icon">
		<input class="menu-icon__cheeckbox" type="checkbox" />
		<div>
			<span></span>
			<span></span>
		</div>
	</div>
</div>

.demo {
	display: flex;
	align-items: center;
	justify-content: center;
	width: 100vw;
	height: 100vh;
	background-image: linear-gradient(
		to top,
		#dad4ec 0%,
		#dad4ec 1%,
		#f3e7e9 100%
	);
	// 	for demo
	.menu-icon {
		transform: scale(1.5);
	}
}

:root {
	--bar-bg: #212529;
}

.menu-icon {
	position: relative;
	width: 50px;
	height: 50px;
	cursor: pointer;

	.menu-icon__cheeckbox {
		display: block;
		width: 100%;
		height: 100%;
		position: relative;
		cursor: pointer;
		z-index: 2;
		-webkit-touch-callout: none;
		position: absolute;
		opacity: 0;
	}
	div {
		margin: auto;
		position: absolute;
		top: 0;
		right: 0;
		left: 0;
		bottom: 0;
		width: 22px;
		height: 12px;
	}
	span {
		position: absolute;
		display: block;
		width: 100%;
		height: 2px;
		background-color: var(--bar-bg, #000);
		border-radius: 1px;
		transition: all 0.2s cubic-bezier(0.1, 0.82, 0.76, 0.965);

		&:first-of-type {
			top: 0;
		}
		&:last-of-type {
			bottom: 0;
		}
	}
	&.active,
	.menu-icon__cheeckbox:checked + div {
		span {
			&:first-of-type {
				transform: rotate(45deg);
				top: 5px;
			}
			&:last-of-type {
				transform: rotate(-45deg);
				bottom: 5px;
			}
		}
	}

	&.active:hover span:first-of-type,
	&.active:hover span:last-of-type,
	&:hover .menu-icon__cheeckbox:checked + div span:first-of-type,
	&:hover .menu-icon__cheeckbox:checked + div span:last-of-type {
		width: 22px;
	}

	&:hover {
		// no need hover effect on mobile.
		@media (min-width: 1024px) {
			span:first-of-type {
				width: 26px;
			}

			span:last-of-type {
				width: 12px;
			}
		}
	}
}

// Can be used with JavaScript
// -----------------------------
// const icnMenu = document.querySelector('.menu-icon');
// icnMenu.addEventListener('click', () => {
// 	icnMenu.classList.toggle('active');
// });