That’s fascinating! I will show how to use CSS variables (or called as CSS custom properties) with examples. 😊
They let you manage and reuse value with in your stylesheets which makes it easier for updates to the code.
Create CSS Variables The syntax of a CSS variable is quite simple, it starts with –, for example: and use variables Assumeyour need to provide same box-shadow values in many places.
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Table of Contents
Defining CSS Variables:
CSS variables are defined using the -- prefix and are typically declared within the :root selector, which represents the document’s root element. This makes the variables global, meaning they can be accessed anywhere in the CSS.
Example
:root {
--main-bg-color: #f0f0f0;
--main-text-color: #333333;
--main-padding: 10px;
}Using CSS Variables
Once you’ve declared your CSS variables, you can use them with the var() function.
body {
background-color: var(--main-bg-color);
color: var(--main-text-color);
padding: var(--main-padding);
}Here’s a complete example demonstrating the use of CSS variables:
Html Code
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>CSS Variables Example</title>
<link rel="stylesheet" href="styles.css">
</head>
<body>
<header>
<h1>Welcome to My Website</h1>
</header>
<main>
<p>This is a sample paragraph demonstrating the use of CSS variables.</p>
</main>
<footer>
<p>© 2024 My Website</p>
</footer>
</body>
</html>CSS Code
:root {
--main-bg-color: #f0f0f0;
--main-text-color: #333333;
--header-bg-color: #4CAF50;
--header-text-color: white;
--main-padding: 20px;
}
body {
background-color: var(--main-bg-color);
color: var(--main-text-color);
padding: var(--main-padding);
font-family: Arial, sans-serif;
}
header {
background-color: var(--header-bg-color);
color: var(--header-text-color);
padding: var(--main-padding);
text-align: center;
}
footer {
text-align: center;
padding: var(--main-padding);
}Benefits of Using CSS Variables
- Maintainability: Easier to manage and update CSS values.
- Reusability: Use the same values in multiple places.
- Theming: Easily switch themes by changing the values of variables.
Advanced Usage
Fallback Values
color: var(--undefined-variable, #000000);Local Scope
CSS variables can also be scoped to a specific element. This means they can be overridden in a specific context.
.card {
--card-bg-color: white;
--card-text-color: black;
background-color: var(--card-bg-color);
color: var(--card-text-color);
}
.card-dark {
--card-bg-color: #333333;
--card-text-color: #f0f0f0;
}<div class="card">This is a card</div>
<div class="card card-dark">This is a dark card</div>Conclusion
CSS variables are a powerful tool for making your CSS more flexible and easier to maintain. By using variables, you can ensure consistency across your stylesheets and make global changes with ease.
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