How to Add a Dark/Light Theme Switcher to a Blogger Blog

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How to Add a Dark/Light Theme Switcher to a Blogger Blog

Creating a blog that is comfortable to read at any time of the day is a great way to enhance your readers' experience. One popular method is to provide a theme switcher that lets users toggle between a light theme and a dark theme. Here's how you can add such a switcher to a Blogger blog:

Step 1: Add the Theme CSS

Go to the Blogger theme customizer (Theme > Customize > Advanced > Add CSS) and add the following CSS:

body.light-theme { --main-bg-color: white; --main-text-color: black; --link-color: blue; } body.dark-theme { --main-bg-color: #282c36; --main-text-color: #abb2bf; --link-color: #61afef; } body { background-color: var(--main-bg-color); color: var(--main-text-color); } a { color: var(--link-color); }

Step 2: Modify the Body Tag

Go to the Blogger HTML editor (Theme > Edit HTML) and replace the existing <body> tag with the following:

<body expr:class='data:blog.pageType == "item" ? "light-theme" : "dark-theme"'>

Step 3: Add the Theme Switching JavaScript

Still in the Blogger HTML editor, add the following JavaScript code right before the closing </body> tag:

<script> function setTheme(themeName) { document.body.className = themeName; document.cookie = 'theme=' + themeName + ';path=/'; } function toggleTheme() { if (document.body.className === 'light-theme') { setTheme('dark-theme'); } else { setTheme('light-theme'); } } (function() { var theme = (document.cookie.match(/(^|;)theme=([^;]+)/) || [,'light-theme'])[1]; setTheme(theme); })(); </script>

Step 4: Add the Theme Switch Button

Finally, add the following button to your blog where you want the theme switcher to appear:

<button onclick='toggleTheme()'>Switch theme</button>

And that's it! Your blog now has a fully functioning theme switcher. Enjoy your new light and dark themes!

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