Light/Dark Theme using Html | Css

Light/Dark Theme using Html | Css | Js

Hello! Let's learn how we can make a Light/Dark theme mode using Html, Css and JavaScript.

Please follow the below code and get started 💻.

HTML Code

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Light and Dark Theme</title>
  <!-- font awesome icons -->
  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.1.1/css/all.min.css" />
  <!-- external css -->
  <link rel="stylesheet" href="style.css">
</head>

<body class="light">
  <div class="container">
    <i class="fa-solid fa-sun"></i>
    <i class="fa-solid fa-moon"></i>
    <button class="switch-btn">
      <span>Switch Theme</span>
    </button>
  </div>

  <script src="./app.js"></script>
</body>

</html>

CSS Code

:root {
  --dark: #101019;
  --light: #f9f9f9;
}

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

body.light {
  background: var(--light);
}

body.dark {
  background: var(--dark);
}

body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: .5s ease;
}

.container {
  position: relative;
  height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.switch-btn {
  background: #007bff;
  padding: .75rem 1.5rem;
  color: var(--light);
  outline: none;
  border: none;
  font-size: 1rem;
  font-family: sans-serif;
  cursor: pointer;
  border-radius: 6px;
  margin: auto;
}

.switch-btn:active {
  transform: scale(0.97);
}

.fa-sun,
.fa-moon {
  position: absolute;
  top: 15%;
  font-size: 4rem;
  transition: .5s ease;
}

.fa-moon {
  color: var(--light);
}

.fa-sun {
  color: #f6b41a;
}

body.dark .fa-sun {
  transform: translateY(-100px) rotate(90deg);
  opacity: 0;
}

body.light .fa-moon {
  transform: translateY(100px) rotate(90deg);
  opacity: 0;
}

JavaScript Code

// selectors
const bodyEle = document.querySelector('body');
const btnEle = document.querySelector('.switch-btn');

// toggle button to switch theme
btnEle.addEventListener('click', () => {
  if (bodyEle.classList[0] === 'light') {
    bodyEle.classList.remove('light')
    bodyEle.classList.add('dark')
  }
  else if (bodyEle.classList[0] === 'dark') {
    bodyEle.classList.remove('dark')
    bodyEle.classList.add('light')
  }
})

Output

That is all! Thank you for visiting my blog.

Code by - AltafAlam Shaikh

Topic covered - toggle() in javascript, transform property in css

Technology used - Html, Css, JavaScript

Light/Dark Theme using Html | Css | Js

Light/Dark Theme using Html | Css | Js

HTML Code

CSS Code

JavaScript Code

Output

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