Digital clock
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<style>
body {
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
margin: 0;
font-family: 'Helvetica', sans-serif;
background-color: #141414;
color: #fff;
...