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CSS3 VARIABLES


2021-11-17 00:15 · 2 min read

A var() function is used to declare CSS variables. Variables are helpful in designing web pages. If we use a similar value on multiple places then it is good to declare a CSS variable.

 

How to declare a CSS variable?

It's very easy to declare a CSS3 variable. A var() function is used to declare a CSS variable. Here we will learn to declare variables.

  • Using:root selector
    We use root selector to declare a global scope, it must begin with 2 dashed (--)
  • Syntax
    Var(variable_name, value);
    Variable name is a required field.
    Value: optional
<style>
/*declare a css variable*/
:root{
--main-color-value:green;
}
div{
background-color:var(--main-color-value);
}
</style>
<head>
<style>
/*declare a css variable*/
:root{
--main-color-value:green;
}
div{
width:100px;
height:100px;
background-color:var(--main-color-value);
}
</style>
</head>

<body>
<div></div>

</body>


some other examples of CSS3 variable declaration.

 

<style>
/*padding*/
:root{
--tdb-padding:10px;
--tab-width:100px;
}
div{
width:var(--tab-width);
height:100px;
padding:(--tab-padding)
}
</style>

 

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