Tailwindmarkup~30 mins

Class-based dark mode strategy in Tailwind - Mini Project: Build & Apply

Choose your learning style9 modes available

Learn Why Deep Render Try Challenge Project Recall Perf

Class-based Dark Mode Strategy with Tailwind CSS

📖 Scenario: You are building a simple webpage that supports dark mode using Tailwind CSS. Instead of relying on the user's system preference, you want to control dark mode by toggling a CSS class on the root element.

🎯 Goal: Create a webpage with a button that toggles dark mode by adding or removing the dark class on the <html> element. The page background and text colors should change accordingly using Tailwind's class-based dark mode strategy.

📋 What You'll Learn

Use Tailwind CSS with class strategy for dark mode

Create a button that toggles the dark class on the <html> element

Use Tailwind classes to style background and text colors differently in light and dark modes

Ensure the page is accessible with proper button labeling

Make the page responsive and visually clear in both modes

💡 Why This Matters

🌍 Real World

Many modern websites let users switch between light and dark themes manually. This project shows how to implement that with Tailwind CSS using a class-based approach.

💼 Career

Understanding dark mode toggling and Tailwind CSS configuration is useful for frontend developers building user-friendly, accessible, and modern web interfaces.

Progress0 / 4 steps

Create the basic HTML structure with Tailwind CSS

Create an HTML file with lang="en", charset="UTF-8", and a viewport meta tag. Inside the <body>, add a <main> element with a heading <h1> that says "Welcome to Dark Mode Demo". Use Tailwind classes bg-white and text-black on <body> for light mode styling.

Tailwind




  
  
  Dark Mode Demo
  


  
    Welcome to Dark Mode Demo

Need a hint?

Remember to include the lang attribute on <html> and use Tailwind classes bg-white and text-black on <body>.

Add a configuration for dark mode class strategy

Add a <script> tag inside the <head> that configures Tailwind CSS to use the class strategy for dark mode by setting tailwind.config = { darkMode: 'class' }.

Tailwind




  
  
  Dark Mode Demo
  
    // Configure Tailwind dark mode to 'class'
  
  


  
    Welcome to Dark Mode Demo

Need a hint?

Place the Tailwind config script before loading Tailwind CSS script.

Add a button to toggle dark mode class on <html>

Inside the <main> element, add a <button> with id="toggle-dark-mode" and accessible label Toggle dark mode. Below the button, add a <script> that adds a click event listener to this button. The listener should toggle the dark class on the document.documentElement (the <html> element).

Tailwind




  
  
  Dark Mode Demo
  
    tailwind.config = { darkMode: 'class' };
  
  


  
    Welcome to Dark Mode Demo
    
  
  
    // Add event listener to toggle dark mode class

Need a hint?

Use document.getElementById to get the button and add a click event listener that toggles the dark class on document.documentElement.

Apply Tailwind dark mode classes for background and text colors

Update the <body> element classes to use bg-white and text-black for light mode, and add dark:bg-gray-900 and dark:text-white for dark mode styling. Also, add Tailwind padding p-6 to <main> for spacing.

Tailwind




  
  
  Dark Mode Demo
  
    tailwind.config = { darkMode: 'class' };
  
  


  
    Welcome to Dark Mode Demo
    Toggle Dark Mode
  
  
    const button = document.getElementById('toggle-dark-mode');
    button.addEventListener('click', () => {
      document.documentElement.classList.toggle('dark');
    });

Need a hint?

Add the dark mode classes dark:bg-gray-900 and dark:text-white to the <body> element and add padding p-6 to <main>.