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HTML

              
                <!--  
Inspired by https://www.youtube.com/watch?v=weZFfrjF-k4 
-->

<div class="page-header"> Analog Clock </div>
<div class="clock">
	<div class="hour"></div>
	<div class="min"></div>
	<div class="sec"></div>
</div>
<div class="switch-cont">
	<button class="switch-btn"> Light </button>
</div>
              
            
!

CSS

              
                :root {
	--main-bg-color: #fff;
	--main-text-color: #888888;
}

[data-theme="dark"] {
	--main-bg-color: #1e1f26;
	--main-text-color: #ccc;
}

* {
	box-sizing: border-box;
	/* 		transition: all ease 0.2s; */
}

body {
	margin: 0;
	height: 100vh;
	display: flex;
	flex-direction: column;
	justify-content: space-between;
	align-items: center;
	font-size: 16px;
	background-color: var(--main-bg-color);
	position: relative;
	transition: all ease 0.2s;
}
.page-header {
	font-size: 2rem;
	color: var(--main-text-color);
	padding: 2rem 0;
	font-family: monospace;
	text-transform: uppercase;
	letter-spacing: 4px;
	transition: all ease 0.2s;
}

.clock {
	min-height: 18em;
	min-width: 18em;
	display: flex;
	justify-content: center;
	align-items: center;
	background-color: var(--main-bg-color);
	background-image: url("https://imvpn22.github.io/analog-clock/clock.png");
	background-position: center center;
	background-size: cover;
	border-radius: 50%;
	border: 4px solid var(--main-bg-color);
	box-shadow: 0 -15px 15px rgba(255, 255, 255, 0.05),
		inset 0 -15px 15px rgba(255, 255, 255, 0.05), 0 15px 15px rgba(0, 0, 0, 0.3),
		inset 0 15px 15px rgba(0, 0, 0, 0.3);
	transition: all ease 0.2s;
}
.clock:before {
	content: "";
	height: 0.75rem;
	width: 0.75rem;
	background-color: var(--main-text-color);
	border: 2px solid var(--main-bg-color);
	position: absolute;
	border-radius: 50%;
	z-index: 1000;
	transition: all ease 0.2s;
}
.hour,
.min,
.sec {
	position: absolute;
	display: flex;
	justify-content: center;
	border-radius: 50%;
}
.hour {
	height: 10em;
	width: 10em;
}
.hour:before {
	content: "";
	position: absolute;
	height: 50%;
	width: 6px;
	background-color: var(--main-text-color);
	border-radius: 6px;
}
.min {
	height: 12em;
	width: 12em;
}
.min:before {
	content: "";
	height: 50%;
	width: 4px;
	background-color: var(--main-text-color);
	border-radius: 4px;
}
.sec {
	height: 13em;
	width: 13em;
}
.sec:before {
	content: "";
	height: 60%;
	width: 2px;
	background-color: #f00;
	border-radius: 2px;
}

/* Style for theme switch btn */
.switch-cont {
	margin: 2em auto;
	/* position: absolute; */
	bottom: 0;
}
.switch-cont .switch-btn {
	font-family: monospace;
	text-transform: uppercase;
	outline: none;
	padding: 0.5rem 1rem;
	background-color: var(--main-bg-color);
	color: var(--main-text-color);
	border: 1px solid var(--main-text-color);
	border-radius: 0.25rem;
	cursor: pointer;
	transition: all ease 0.3s;
}

              
            
!

JS

              
                // Just noticed accessing localStorage is banned from codepen, so disabling saving theme to localStorage

const deg = 6;
const hour = document.querySelector(".hour");
const min = document.querySelector(".min");
const sec = document.querySelector(".sec");

const setClock = () => {
	let day = new Date();
	let hh = day.getHours() * 30;
	let mm = day.getMinutes() * deg;
	let ss = day.getSeconds() * deg;

	hour.style.transform = `rotateZ(${hh + mm / 12}deg)`;
	min.style.transform = `rotateZ(${mm}deg)`;
	sec.style.transform = `rotateZ(${ss}deg)`;
};

// first time
setClock();
// Update every 1000 ms
setInterval(setClock, 1000);

const switchTheme = (evt) => {
	const switchBtn = evt.target;
	if (switchBtn.textContent.toLowerCase() === "light") {
		switchBtn.textContent = "dark";
		// localStorage.setItem("theme", "dark");
		document.documentElement.setAttribute("data-theme", "dark");
	} else {
		switchBtn.textContent = "light";
		// localStorage.setItem("theme", "light"); //add this
		document.documentElement.setAttribute("data-theme", "light");
	}
};

const switchModeBtn = document.querySelector(".switch-btn");
switchModeBtn.addEventListener("click", switchTheme, false);

let currentTheme = "dark";
// currentTheme = localStorage.getItem("theme")
// 	? localStorage.getItem("theme")
// 	: null;

if (currentTheme) {
	document.documentElement.setAttribute("data-theme", currentTheme);
	switchModeBtn.textContent = currentTheme;
}

              
            
!
999px

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