Add dark mode to your site with this short CSS trick

Gábor Soós on September 10, 2019

Most applications nowadays have dark mode: your command line, your IDE, your browser, etc. Why would your site be any different? Your website can a... [Read Full]
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What's more likely to happen in this case is that you'll have color set on specific parts of the site for different things. So the better thing to do is to use CSS variables.

CSS Variables example for dark mode


Simple but effective. Thanks for sharing

Just to enrich the conversation I want to add that another consideration is that if you are using styled-components a dark theme might be accomplished with something in a similar way, for example:

const prefersDark = window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches

const lightTheme = {
    color: 'black',
    backgroundColor: 'white',

const darkTheme = {
    color: 'white',
    backgroundColor: 'black',

// ...

render() {
        <ThemeProvider theme={prefersDark ? darkTheme : lightTheme} >


When I change to dark theme in Firefox then this line:
window.matchMedia("(prefers-color-scheme: dark)").matches
still returns false.


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