What are CSS variables, and how can they improve maintainability in large project?

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Ashutosh Kumar Verma · Answer

CSS variables, also known as custom properties, allow you to define reusable values ​​that can be applied throughout your CSS. This makes managing styles in large projects easier and more consistent because you can change a variable value in one place and have it reflected everywhere it is used.
Variables are defined using the -- prefix and accessed with the 
var() function.
Defining a variable
:root {
 --primary-color: #3498db;
 --font-size-large: 18px;
}
Using a variable
h1 {
 color: var(--primary-color);
 font-size: var(--font-size-large);
}
Benefits
Consistency: Variables ensure that styles such as color and font size are consistent throughout the project.
Easy updates: If you need to update a color or size, you only need to change it in the variable declaration, reducing the chance of missing instances of that value.
Dynamic theming: Variables can be easily modified at runtime, enabling changes to the theme or mode (e.g., light/dark mode).
Maintainability: In large projects, CSS variables significantly reduce the need for duplication and make style sheets easier to maintain.
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What are CSS variables, and how can they improve maintainability in large project?

Ashutosh Kumar Verma

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