The rest is pretty self explanatory theme colours and the default application of the light theme. I probably wouldn’t do this on a production site, but it’s a pretty cool trick, and ever since I saw on Twitter that Lea Verou was demoing this technique in her talk, I really wanted to have a go We’re defining some SVG icons in CSS (I know, cool, right?).This is used to communicate to the JavaScript what the user’s preference is We define the -color-mode variable and set it to 'light' by default.There’s a big chunk in there, so let’s break it down a bit: button-icon-filter: var(-icon-moon-filter) Paste this into your CSS file (or CSS panel on CodePen): We’ll add our core presentational styles first. That’s all of the HTML that we need and the element only serves as a demo. This also benefits users that don’t (prefers-color-scheme: dark) set because they get a toggle to Yes, by default, when a user (prefers-color-scheme: dark) set, we should set a dark theme,īut we should also provide a switch for if the dark them isn’t working out for them. In your HTML file (or HTML panel in CodePen), add the following code:ĭark mode should be a user preference-not presumed I’ve built this in Codepen to make things easier for us all. You’re going to need a HTML file, a CSS file and a JavaScript file. If not, follow along to add the following base code. #Html dark mode switch code#You can skip this section completely and fork the base code on CodePen. This is then maintained by local storage. I then use the toggle to switch the theme. The video shows that because my operating system is in dark mode, the demo honours it by default. What we are building Video shows a dark theme by default being toggled by a toggle button on click. It’s important to not make presumptions in design if you can help it, so I’m going to show you a quick and easy way to honour the user’s operating system preference by default, but also give them a toggle button to change their preference, manually. Oftentimes, though, folks will do one of the most dangerous things in design: make a presumption and roll out a dark theme if the user’s operating system preference is dark mode, and just leave it at that. Ever since the prefers-color-scheme media query landed, folks have been rolling out dark themes for their websites as often as they use the entire React library to power a hamburger menu on their static blog.Ī lot of the time, folks rightly add a dark/light switch to give the user a choice.
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