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Shobha
The best way to predict the future is to invent it

How do you define custom properties (CSS variables)?

Custom properties, or CSS variables, are defined using the -- prefix inside a selector and are accessed using the var() function. They allow reusable, maintainable styles across a stylesheet. For example,
:root {
--primary-color: #3498db;
--font-size: 16px;
}

body {
color: var(--primary-color);
font-size: var(--font-size);
}

Here, --primary-color and --font-size are variables that can be reused, ensuring consistency and simplifying updates.