NashTech Insights

Exploring CSS Custom Properties

Table of Contents
Exploring CSS Custom Properties


In the world of web development, CSS Custom Properties, also known as CSS variables, have emerged as a game-changer. They offer developers flexibility and control over styling, enabling them to create dynamic and responsive designs with ease. In this blog, we’ll delve into the world of CSS Custom Properties, exploring what they are, how to use them, and the benefits they bring to modern web development.

Understanding CSS Custom Properties

CSS Custom Properties, denoted by the -- prefix, allow developers to define reusable values in CSS. Unlike traditional variables in programming, CSS Custom Properties are not confined to a specific scope; they can be used globally throughout your CSS stylesheet. This means you can declare a custom property at the root level of your stylesheet and use it across various elements and even multiple stylesheets.

Declaring and Using Custom Properties

To declare a custom property, use the following syntax:

:root {
  --primary-color: #3498db;
  --font-size: 16px;

In this example, --primary-color and --font-size are custom properties set to a blue color and a font size of 16 pixels, respectively. Now, you can use these properties anywhere in your stylesheet:

.button {
  background-color: var(--primary-color);
  font-size: var(--font-size);

Benefits of CSS Custom Properties

1. Dynamic Styling: One of the main advantages of this is their ability to create dynamic and responsive styles. You can change the value of a custom property using JavaScript, allowing you to create interactive designs that adapt to user interactions or device conditions.

2. Consistency and Reusability: Custom Properties promote consistency by allowing you to define common values in one place. This makes it easier to maintain a unified design across your website. When you need to make changes, you can update the custom property, and the changes will be reflected across all elements using that property.

3. Media Query Flexibility: Custom Properties can be used inside media queries, enabling you to create responsive designs that adapt to different screen sizes. This flexibility simplifies the process of adjusting styles for various devices.

4. Code Efficiency: By using Custom Properties, you reduce the need for repetitive code. This not only improves the maintainability of your codebase but also helps in minimizing the file size of your stylesheets.

5. Easy Theming: Custom Properties are particularly useful for theming. You can define a set of properties for different themes and switch between them by changing a single value.


CSS Custom Properties have brought a new level of versatility and control to the world of web design. Their ability to promote reusability, consistency, dynamic theming, responsive design, and interactive experiences makes them a valuable addition to any developer’s toolkit. By mastering the art of CSS Custom Properties, you’ll unlock the potential to create more efficient, adaptable, and visually captivating websites.

Finally, for more such updates and to read more about such topics, please follow our LinkedIn page Frontend Competency



Aanchal Agarwal is a Software Consultant at NashTech. Her practice area is web development. She is recognized as a multi-talented, multitasker, and adaptive to the different work environments. Her hobbies include watching movies, listening to music, and traveling. She likes to read books and explore new things.

Leave a Comment

Your email address will not be published. Required fields are marked *

Suggested Article

%d bloggers like this: