Bootstrap 5 Tutorial

Bootstrap 5 Dark Mode

Last modified on: October 27, 2024

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<h3>Bootstrap 5: Dark Mode</h3>
<p>Bootstrap 5 doesn&rsquo;t come with a built-in dark mode toggle, but it provides the tools to create one using utility classes, variables, and custom CSS. Dark mode has become a popular feature for modern websites, providing a visually appealing alternative for low-light environments and reducing eye strain.</p>
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<h3>How to Implement Dark Mode in Bootstrap 5</h3>
<ol>
<li><strong>Using CSS Variables</strong>: Bootstrap 5 leverages CSS variables, allowing for easy theme customization. You can redefine colors for light and dark themes using these variables.</li>
<li><strong>JavaScript Toggle</strong>: Use JavaScript to toggle between light and dark mode by applying a specific class to the <code>body</code> or root element.</li>
<li><strong>Dark Mode Class</strong>: Create a custom class for dark mode that adjusts colors, backgrounds, and other stylistic elements accordingly.</li>
</ol>
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<h3>Step-by-Step Dark Mode Implementation Example</h3>
<h4>1. Define Dark Mode Variables in CSS</h4>
<p>Override Bootstrap&rsquo;s default colors by defining new CSS variables for dark mode.</p>
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<pre class="language-css"><code>/* Dark mode styles */
body.dark-mode {
    --bs-body-bg: #121212;
    --bs-body-color: #ffffff;
    --bs-primary: #bb86fc;
    --bs-secondary: #03dac6;
    --bs-dark: #ffffff;
    --bs-light: #333333;
}
</code></pre>
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<h4>2. Apply Styles Using a Toggle Button</h4>
<p>Add a button that switches between light and dark modes by toggling the <code>dark-mode</code> class on the <code>body</code>.</p>
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<pre class="language-markup"><code>&lt;!DOCTYPE html&gt;
&lt;html lang="en"&gt;
&lt;head&gt;
    &lt;meta charset="UTF-8"&gt;
    &lt;meta name="viewport" content="width=device-width, initial-scale=1.0"&gt;
    &lt;title&gt;Bootstrap 5 Dark Mode&lt;/title&gt;
    &lt;link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/css/bootstrap.min.css" rel="stylesheet"&gt;
    &lt;style&gt;
        /* Include dark mode CSS variables here */
        body.dark-mode {
            --bs-body-bg: #121212;
            --bs-body-color: #ffffff;
            --bs-primary: #bb86fc;
            --bs-secondary: #03dac6;
            --bs-dark: #ffffff;
            --bs-light: #333333;
        }
        body {
            background-color: var(--bs-body-bg);
            color: var(--bs-body-color);
        }
    &lt;/style&gt;
&lt;/head&gt;
&lt;body&gt;

&lt;div class="container py-5"&gt;
        &lt;!-- Dark Mode Toggle Button --&gt;
        &lt;button id="darkModeToggle" class="btn btn-secondary"&gt;Toggle Dark Mode&lt;/button&gt;
        
        &lt;h1 class="mt-3"&gt;Bootstrap 5 Dark Mode Example&lt;/h1&gt;
        &lt;p&gt;Click the button above to switch between light and dark modes.&lt;/p&gt;
    &lt;/div&gt;

&lt;script&gt;
        // Dark mode toggle script
        document.getElementById('darkModeToggle').addEventListener('click', function () {
            document.body.classList.toggle('dark-mode');
        });
    &lt;/script&gt;
&lt;/body&gt;
&lt;/html&gt;
</code></pre>
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<h4>Explanation</h4>
<ul>
<li><strong>CSS Variables</strong>: Sets variables for background, text, and color properties in <code>dark-mode</code>.</li>
<li><strong>JavaScript Toggle</strong>: A button toggles the <code>dark-mode</code> class, switching between light and dark modes.</li>
<li><strong>Color Application</strong>: Colors are applied using Bootstrap variables, so components like buttons or cards automatically inherit the dark mode theme.</li>
</ul>
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<h3>&nbsp;</h3>
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