# How to Build a Secret Dark Mode Toggle for Your Blog

DevFeed: [How to Build a Secret Dark Mode Toggle for Your Blog](<https://devfeed.tech/articles/how-to-build-a-secret-dark-mode-toggle-for-your-blog-40738.md>)

Original publisher: [Read original article](<https://radek.io/posts/secret-darkmode-toggle/>)

Published: 2020-10-26T00:00:00Z

Content type: tutorial

Language: en

Sources: [Radek Pazdera](<https://devfeed.tech/sources/radek-pazdera.md>)

Topics: [Dark Mode](<https://devfeed.tech/topics/dark-mode.md>), [CSS](<https://devfeed.tech/topics/css.md>), [HTML](<https://devfeed.tech/topics/html.md>), [JavaScript](<https://devfeed.tech/topics/javascript.md>), [Vanilla JavaScript](<https://devfeed.tech/topics/vanilla-js.md>), [Web Development](<https://devfeed.tech/topics/web-development.md>)

Tags: [css](<https://devfeed.tech/tags/css.md>), [dark-mode](<https://devfeed.tech/tags/dark-mode.md>), [how-to](<https://devfeed.tech/tags/how-to.md>), [html](<https://devfeed.tech/tags/html.md>), [javascript](<https://devfeed.tech/tags/javascript.md>)

## AI overview

A tutorial on building a secret dark mode toggle for a blog using vanilla HTML, CSS, and JavaScript. It covers theme custom properties, detecting the operating system's dark mode setting, creating a toggle, and hiding an Easter egg.

## Source excerpt

A simple Easter egg in vanilla HTML, CSS and JavaScript