Toggle themes with CSS

Toggling themes using global variables and CSS is a common approach in modern web development to switch between light and dark modes or other theme variations.

By defining theme variables in CSS, such as colors, fonts, and spacing, developers can easily manage and switch themes. A global variable, often stored in JavaScript, tracks the current theme. When a user toggles the theme, JavaScript updates this variable and modifies the document's root element class or data attribute.

CSS then applies the corresponding styles based on the active theme, allowing for a seamless and dynamic user experience. This method ensures maintainable and scalable theming across the application.