code preview
html code
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<button id="btn">DARK</button>
</body>
</html>
css code
* {
padding: 0;
margin: 0;
box-sizing: border-box;
}
body {
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
transition: background 0.5s;
}
body.light {
background-color: #e8e8e8;
}
body.dark {
background-color: #212121;
}
#btn {
padding: 10px 15px;
cursor: pointer;
border: 0;
outline: none;
background-color: #212121;
font-size: 1rem;
color: #fff;
font-weight: 600;
letter-spacing: 1px;
border-radius: 4px;
box-shadow: 3px 3px 5px rgba(0, 0, 0, 0.25);
}
javascript code
document.body.classList.add('light');
document.getElementById('btn').addEventListener('click', () => {
document.body.classList.toggle('dark');
document.body.classList.toggle('light');
const btn = document.getElementById('btn');
if (btn.innerText === 'DARK') {
btn.innerText = 'LIGHT';
btn.style.backgroundColor = '#e8e8e8'
btn.style.color = '#000'
} else {
btn.innerText = 'DARK';
btn.style.backgroundColor = '#212121';
btn.style.color = '#fff'
}
})
