How to make a smooth Dark/Light mode transformation

Okay, so you're on a website, and it's in dark mode. But you prefer light mode (if you do, well, that's your prerogative ?). It's 3 AM. You click the dark/light mode toggle. Suddenly, a flash! Temporary blindness ensues, followed by tinnitus and a seizure. A costly trip to the ER later (thanks, US healthcare system!), and you're out thousands.

That was a bit of hyperbole, but the jarring theme switch is undeniably annoying. Let's fix it! Using cutting-edge CSS (okay, maybe not that cutting-edge), we can implement a smooth transition. I'll provide the code and explanation.

First, you'll need a theme switcher. Check out This Link for instructions if you don't already have one. This method is compatible with CSS variables (--color: blue;) and similar approaches.

Here's the code:

* {
  transition-duration: 1s;
}

Adjust the 1s (one second) to your preferred transition speed.

The asterisk (*) is a universal selector, meaning every element on the page is affected. By setting transition-duration, we tell the browser to apply a smooth transition whenever any property of any element changes. Simple!

Thanks for reading!

Andrew McSillyone

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