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CSS Custom Properties, Media Queries, And Responsive Design

One thing you can do with CSS custom properties that you can’t do with factors in preprocessors is reclassify them and allot new qualities inside @media inquiries. It’s a valuable capacity to have and one more motivation behind why you’d need to work with what are successfully local CSS factors.

The most recent couple of weeks I’ve been taking a gander at custom properties. I started by strolling through how to characterize and utilize them and a week ago I began to take a gander at some straightforward guides to make your code more decipherable and to help with logical styling.

Those models didn’t exploit the dynamic abilities of custom properties and I need to change that beginning today. I need to give you how we can utilize custom properties inside @media questions in a manner you can’t with factors in preprocessors like Backtalk or Less.

Changing Shading Inside @media Questions

We should begin with a basic model where I’ll change the foundation shade of the body component dependent on screen width.

I characterized two custom properties, one for the foundation shading (#fff) and one for text shading (#000). I set both on :root so they’re viably worldwide factors.

I at that point utilized the var() work on the foundation shading and shading properties of the body component so as to utilize the two custom properties.

:root {

– body-foundation: #fff;

– body-shading: #000;


body {

foundation shading: var(- – body-foundation);

shading: var(- – body-shading);


Envision you need the shading and foundation shade of the body to change as the watcher’s screen gets more extensive. We should flip the hues at 30em so we get white content on a dark foundation and afterward at 60em, how about we change the foundation to dim green and utilize its supplement, a light purple, as the content shading cssminifiers.

Without custom properties, you’d set new qualities for both the foundation shading and shading properties inside the suitable @media inquiries. That would absolutely achieve a similar objective. With custom properties we can rather rethink the custom properties straightforwardly.

@media (min-width: 30em) {

:root {

– body-foundation: #000;

– body-shading: #fff;



@media (min-width: 60em) {

:root {

– body-foundation: #232;

– body-shading: #dcd;



You may imagine that wasn’t anything unique and that it was no simpler than setting new qualities on the two properties. You’re likely right with such a straightforward model. Notwithstanding, with more intricate models having the option to rethink a couple of custom properties will probably be simpler than superseding all the CSS properties that depend on a couple preprocessor factors.

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