Variables in Media Query

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Variables in Media Queries

Using Variables in Media Queries

Firstly, we’ll declare a new local variable named –fontsize for the .container class and set its value to 25 pixels. Then, it is used  in the .container class. Then, A @media rule is created that defines “When the browser’s width is 450px or wider, change the –fontsize variable value of the .container class to 50px.”

Below is an example:

HTML
				
					<h6>Using Variables in Media Queries</h6>
<div class="container">
  <h2>Lorem Ipsum</h2>
  <p>When the browser's width is less than 450px, the font-size of this div is 25px. When it is 450px or wider, set the --fontsize variable value to 50px. Resize the browser window to see the effect.</p>
</div>
CSS
				
					/* 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;
  }
}

Output

Using Variables in Media Queries

Lorem Ipsum

When the browser's width is less than 450px, the font-size of this div is 25px. When it is 450px or wider, set the --fontsize variable value to 50px. Resize the browser window to see the effect.

Below is an example in which the value of the –blue variable in the @media rule is changed:

HTML
				
					<h6>Using Variables in Media Queries</h6>
<div class="container">
  <h2>Lorem Ipsum</h2>
  <p>When the browser's width is 450px or wider, set the --fontsize variable value to 50px and the --blue variable value to lightblue. Resize the browser window to see the effect.</p>
</div>
CSS
				
					/* 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;
  }
}

Output

Using Variables in Media Queries

Lorem Ipsum

When the browser's width is 450px or wider, set the --fontsize variable value to 50px and the --blue variable value to lightblue. Resize the browser window to see the effect.