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About the <head>

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CSS

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HTML 

              
                <html>
<html lang='en'>

<head>
	<meta charset='utf-8'>
	<meta name='viewport' content='width=device-width, initial-scale=1, shrink-to-fit=no'>
	<!-- Boxicons CSS -->
	<link href='https://unpkg.com/[email protected]/css/boxicons.min.css' rel='stylesheet'>
	<title>Dashboard</title>
</head>

<body>
	<nav class='sidebar close'>
		<header>
			<div class='image-text'>
				<span class='image'>
					<img src="https://www.adaptivewfs.com/wp-content/uploads/2020/07/logo-placeholder-image.png" alt="logo" />
				</span>

				<div class='text header-text'>
					<span class='name'>Jothinayagan</span>
					<span class='profession'>Web Developer</span>
				</div>
			</div>

			<i class='bx bx-chevron-right toggle'></i>

		</header>

		<div class='menu-bar'>
			<div class='menu'>
				<li class='search-box'>
					<a href="#">
						<i class='bx bx-search icon'></i>
						<input type="search" placeholder="Search" />
					</a>
				</li>
				<ul class='menu-links'>
					<li class='nav-link'>
						<a href="#">
							<i class='bx bx-home-alt icon'></i>
							<span class='text nav-text'>Dashboard</span>
						</a>
					</li>
					<li class='nav-link'>
						<a href="#">
							<i class='bx bx-bar-chart-alt-2 icon'></i>
							<span class='text nav-text'>Revenue</span>
						</a>
					</li>
					<li class='nav-link'>
						<a href="#">
							<i class='bx bx-bell icon'></i>
							<span class='text nav-text'>Notifications</span>
						</a>
					</li>
					<li class='nav-link'>
						<a href="#">
							<i class='bx bx-pie-chart-alt icon'></i>
							<span class='text nav-text'>Analytics</span>
						</a>
					</li>
					<li class='nav-link'>
						<a href="#">
							<i class='bx bx-heart icon'></i>
							<span class='text nav-text'>Likes</span>
						</a>
					</li>
					<li class='nav-link'>
						<a href="#">
							<i class='bx bx-wallet icon'></i>
							<span class='text nav-text'>Wallet</span>
						</a>
					</li>
				</ul>
			</div>

			<div class='bottom-content'>
				<li class='nav-link'>
					<a href="#">
						<i class='bx bx-log-out icon'></i>
						<span class='text nav-text'>Logout</span>
					</a>
				</li>
				<li class='mode'>
					<div class='moon-sun'>
						<a href="#">
							<i class='bx bx-sun icon sun'></i>
							<i class='bx bx-moon icon moon'></i>
						</a>
					</div>
					<span class='mode-text text'>Dark Mode</span>
					<div class='toggle-switch'>
						<span class='switch'></span>
					</div>
				</li>
			</div>
		</div>
	</nav>
	<section class="home">
		<div class="text">Dashboard</div>
	</section>
</body>

</html>
!

CSS 

              
                @import url("https://fonts.googleapis.com/css2?family=Lato&display=swap");

* {
	margin: 0;
	padding: 0;
	box-sizing: border-box;
}

:root {
	/* Colors */
	--body-color: #e4e9f7;
	--sidebar-color: #fff;
	--primary-color: #695cfe;
	--primary-color-light: #f6f5ff;
	--toggle-color: #ddd;
	--text-color: #707070;

	/* Transition */
	--tran-02: all 0.2s ease;
	--tran-03: all 0.3s ease;
	--tran-04: all 0.3s ease;
	--tran-05: all 0.3s ease;
}

body {
	font-family: "Lato", sans-serif;
	height: 100vh;
	background: var(--body-color);
	transition: var(--tran-05);
}

body.dark {
	--body-color: #18191a;
	--sidebar-color: #242526;
	--primary-color: #3a3b3c;
	--primary-color-light: #3a3b3c;
	--toggle-color: #fff;
	--text-color: #ccc;
}

/* sidebar */
.sidebar {
	position: fixed;
	top: 0;
	left: 0;
	height: 100%;
	width: 250px;
	padding: 10px 14px;
	background: var(--sidebar-color);
	transition: var(--tran-05);
	z-index: 1;
}

.sidebar.close {
	width: 88px;
}

.sidebar.close .text {
	display: none;
}

/* Reusable CSS */
.sidebar .text {
	font-size: 16px;
	font-weight: 500;
	color: var(--text-color);
	transition: var(--tran-04);
	white-space: nowrap;
}

.sidebar .image {
	min-width: 60px;
	display: flex;
	align-items: center;
	justify-content: center;
}

.sidebar header {
	position: relative;
}

.sidebar li {
	display: flex;
	align-items: center;
	height: 50px;
	margin-top: 10px;
	list-style: none;
}

.sidebar li .icon {
	display: flex;
	align-items: center;
	justify-content: center;
	min-width: 60px;
	font-size: 20px;
}

.sidebar li .icon,
.sidebar li .text {
	color: var(--text-color);
}

.sidebar li a {
	height: 100%;
	width: 100%;
	display: flex;
	align-items: center;
	border-radius: 10px;
	text-decoration: none;
	transition: var(--tran-04);
}

.sidebar li a:hover {
	background: var(--primary-color);
	transition: var(--tran-02);
}

.sidebar li a:hover .icon,
.sidebar li a:hover .text {
	color: var(--sidebar-color);
}

body.dark .sidebar li a:hover .icon,
body.dark .sidebar li a:hover .text {
	color: var(--text-color);
}

.sidebar .image-text img {
	width: 60px;
	border-radius: 6px;
}

.sidebar .search-box {
	background: var(--primary-color-light);
	border-radius: 6px;
	transition: var(--tran-05);
}

.search-box input {
	height: 100%;
	width: 100%;
	border: none;
	outline: none;
	background: var(--primary-color-light);
	border-radius: 6px;
	font-size: 16px;
	font-weight: 500;
	color: var(--text-color);
}

.sidebar header .image-text {
	display: flex;
	align-items: center;
}

header .image-text .header-text {
	display: flex;
	flex-direction: column;
}

.header-text .name {
	font-size: 20px;
	font-weight: 700;
}

.header-text .profession {
	margin-top: -2px;
}

.sidebar header .toggle {
	position: absolute;
	top: 50%;
	right: -25px;
	transform: translatey(-50%) rotate(180deg);
	height: 25px;
	width: 25px;
	background: var(--primary-color);
	display: flex;
	align-items: center;
	justify-content: center;
	border-radius: 50%;
	color: var(--sidebar-color);
	font-size: 22px;
	transition: translatey(--tran-03);
}

.sidebar.close header .toggle {
	transform: translatey(-50%);
}

body.dark .sidebar header .toggle {
	color: var(--text-color);
}

.sidebar .menu {
	margin-top: 25px;
}

.sidebar .menu-bar {
	/* 	background: red; */
	height: calc(100% - 50px);
	display: flex;
	flex-direction: column;
	justify-content: space-between;
}

.menu-bar .mode {
	position: relative;
	border-radius: 6px;
	background: var(--primary-color-light);
}

.menu-bar .mode .moon-sun {
	height: 50px;
	width: 60px;
	display: flex;
	align-items: center;
}

.menu-bar .mode i {
	position: absolute;
	transform: var(--text-03);
}

.menu-bar .mode i.sun {
	opacity: 0;
}

body.dark .menu-bar .mode i.sun {
	opacity: 1;
}

body.dark .menu-bar .mode i.moon {
	opacity: 0;
}

.menu-bar .mode .toggle-switch {
	position: absolute;
	right: 0;
	display: flex;
	align-items: center;
	justify-content: center;
	height: 100%;
	min-width: 60px;
	cursor: pointer;
	border-radius: 6px;
	background: var(--primary-color-light);
	/* 	transition: var(--tran-05); */
}

.toggle-switch .switch {
	position: relative;
	height: 22px;
	width: 44px;
	border-radius: 25px;
	background: var(--toggle-color);
}

.switch::before {
	content: "";
	position: absolute;
	height: 15px;
	width: 15px;
	border-radius: 50%;
	top: 50%;
	left: 5px;
	transform: translatey(-50%);
	background: var(--sidebar-color);
	transition: var(--tran-03);
}

body.dark .switch::before {
	left: 24px;
}

.home {
	position: relative;
	height: 100vh;
	left: 250px;
	width: calc(100% - 250px);
	transition: var(--tran-05);
}

.home .text {
	font-weight: 500;
	font-size: 30px;
	color: var(--text-color);
	padding: 8px 40px;
}

.sidebar.close ~ .home {
	left: 88px;
	height: 100vh;
	width: calc(100% - 88px);
}
!

JS 

              
                const body = document.querySelector("body");
const sidebar = document.querySelector("nav");
const toggle = document.querySelector(".toggle");
const searchBox = document.querySelector(".search-box");
const modeSwitch = document.querySelector(".toggle-switch");
const modeText = document.querySelector(".mode-text");

toggle.addEventListener("click", () => {
	sidebar.classList.toggle("close");
});

searchBox.addEventListener("click", () => {
	sidebar.classList.remove("close");
});

modeSwitch.addEventListener("click", () => {
	body.classList.toggle("dark");

	modeText.innerText = body.classList.contains("dark")
		? "Light Mode"
		: "Dark Mode";
});
!
999px

Console