CSS Tutorial
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CSS Advanced
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CSS Responsive
CSS Grid
CSS User Variables
The var() function inserts the value of a CSS variable.
CSS variables have access to the DOM, which means that it enables the user to create variables with local or global scope, alter the variables with JavaScript, and change the variables depending on media queries.
Using CSS variables is a great way, when it comes to the colors used for designing. In place of using copy and paste the same colors over and over again, you can store them in variables.
The Traditional Way
The example below displays the traditional way of specifying some colors in a style sheet (by defining the colors to use, for each specific element):
HTML
The Traditional Way
Lorem Ipsum
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Etiam semper diam at erat pulvinar, at pulvinar felis blandit.
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Etiam semper diam at erat pulvinar, at pulvinar felis blandit.
CSS
body {
background-color: lightblue;
}
h2 {
border-bottom: 2px solid #1e90ff;
}
.container {
color: #1e90ff;
background-color: #ffffff;
padding: 15px;
}
button {
background-color: #ffffff;
color: #1e90ff;
border: 1px solid #1e90ff;
padding: 5px;
}
Output

How var() Works
CSS variables can have a global or local scope.
Global variables can be used throughout the document, while local variables can be used only be declared within the selector.
To defines a variable with global scope, declare it within the :root selector. The :root selector and the document’s root element are matched.
To define a variable with local scope, declare it within the selector that is to be used .
The below example is similar to the example above, but here the var() function is used.
Firstly, two global variables (–blue and –white) are declared. Then, the var() function is used to insert the value of the variables in the the later part of style sheet:
HTML
Using the var() Function
Lorem Ipsum
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Etiam semper diam at erat pulvinar, at pulvinar felis blandit.
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Etiam semper diam at erat pulvinar, at pulvinar felis blandit.
CSS
:root {
--blue: #1e90ff;
--white: #ffffff;
}
body {
background-color: var(--blue);
}
h2 {
border-bottom: 2px solid var(--blue);
}
.container {
color: var(--blue);
background-color: var(--white);
padding: 15px;
}
button {
background-color: var(--white);
color: var(--blue);
border: 1px solid var(--blue);
padding: 5px;
}
Output

Advantages of using var() are:
- The code is easy to read.
- It is easy to change the color values.