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CSS Using Variables in Media Queries


Using Variables in Media Queries
Now we want to change a variable value inside a media query.

Tip: Media Queries are about defining different style rules
for different devices (screens, tablets, mobile phones, etc.). You can learn more
Media Queries in our Media Queries Chapter.

Here, we first declare a new local variable named --fontsize for the
.container class. We set its value to 25 pixels. Then we use it in the
.container class further down. Then, we create a
@media rule that says "When the browser's width
is 450px or wider, change the --fontsize variable value of the
.container class to 50px."
Here is the complete example:

Example

/* Variable declarations */ :root {  --blue: #1e90ff;  --white: #ffffff;
}
.container {  --fontsize: 25px;}/* Styles */body { 
background-color: var(--blue);}h2 {  border-bottom: 2px solid var(--blue);}.container
{  color: var(--blue);  background-color: var(--white); 
padding: 15px;  font-size: var(--fontsize);}@media screen and (min-width:
450px) { 
.container {    --fontsize: 50px;  }}

Try it Yourself »









Here is another example where we also change the value of the --blue variable
in the @media rule:

Example

/* Variable declarations */ :root {  --blue: #1e90ff;  --white: #ffffff;
}
.container {  --fontsize: 25px;}/* Styles */body { 
background-color: var(--blue);}h2 {  border-bottom: 2px solid var(--blue);}.container
{  color: var(--blue);  background-color: var(--white); 
padding: 15px;  font-size: var(--fontsize);}@media screen and (min-width:
450px) { 
.container {    --fontsize: 50px;  }  
:root {    --blue: lightblue;  }}

Try it Yourself »



Browser Support
The numbers in the table specify the first browser version that fully supports the
var() function.



Function







var()
49.0
15.0
31.0
9.1
36.0




CSS var() Function


Property
Description


var()
Inserts the value of a CSS variable














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+1

Reference: https://www.w3schools.com/css/css3_vari ... ueries.asp