Science Knowings: JavaScript Course For Social Media

CSS Variables (Custom Properties)

CSS Variables (Custom Properties)

Welcome back! In the previous session, we discussed HTML templates and copywriting. In this session, we'll take a deep dive into CSS variables, an essential tool for enhancing your CSS codebase.

Introduction to CSS Variables

CSS variables, also known as custom properties, allow you to store and reuse values throughout your stylesheets, making your code more maintainable and efficient.

Benefits of Using CSS Variables

Benefits of using CSS variables include:

  • Code reusability
  • Theme switching
  • Dynamic styling
  • Improved readability

Declaring CSS Variables

To declare a CSS variable, use the -- prefix followed by the variable name. Assign a value using the : operator (e.g., --primary-color: #007bff).

Scopes of CSS Variables

CSS variables have different scopes, including:

  • Global (available to the entire document)
  • Local (only available to the element or its descendants)

Using CSS Variables in Stylesheets

To use a CSS variable in your stylesheets, simply reference it using the var() function (e.g., color: var(--primary-color)).

Dynamically Updating CSS Variables

You can dynamically update CSS variables using JavaScript or CSS animations. This allows you to change styles on the fly.

Browser Support for CSS Variables

CSS variables are widely supported in modern browsers, including Chrome, Firefox, Edge, and Safari.

Best Practices for Using CSS Variables

Follow these best practices:

  • Use descriptive variable names
  • Avoid overusing variables
  • Test browser support


CSS variables are a powerful tool that can enhance your CSS code. They promote code reusability, improve readability, and enable dynamic styling.

Next Up: CSS Grid Layout

In the next session, we'll explore CSS Grid Layout, a powerful tool for creating complex and responsive layouts. Follow us to learn more!