CSSvariabler

CSS variables, also known as custom properties, are entities defined by CSS authors that contain specific values to be reused throughout a document. They are set using a double-hyphen prefix, like --main-color: black;, and are accessed using the var() function, such as color: var(--main-color);. This allows for a more dynamic and maintainable approach to styling web pages.

One of the primary benefits of CSS variables is their ability to promote consistency. By defining a value once, such as a primary color or font size, and reusing it across multiple elements, developers ensure that these values are applied uniformly. This simplifies the process of updating styles; changing the variable's value in one place automatically updates it everywhere it's used.

CSS variables also enhance flexibility and theming capabilities. They can be easily modified with JavaScript, enabling dynamic style changes in response to user interactions or application state. This is particularly useful for creating themes or adapting designs to different contexts. Furthermore, CSS variables can be scoped to specific selectors, allowing for localized style adjustments without affecting the entire document. Their cascading nature means that variables defined within a more specific selector will override those defined in a broader one.