learn css variables in 7 minutes

sure! css variables, also known as custom properties, allow you to store values in a variable-like format and reuse them throughout your stylesheet. this feature improves maintainability and flexibility in your css.

what are css variables?

css variables are defined using the `--` syntax and can be accessed using the `var()` function. they can hold any css value, including colors, lengths, and even entire css rules.

benefits of using css variables

1. **reusability**: define a value once and reuse it multiple times.
2. **maintainability**: change a value in one place, and it updates everywhere it’s used.
3. **dynamic updates**: css variables can be manipulated with javascript for dynamic styling.

defining css variables

css variables are defined within a selector, typically in the `:root` pseudo-class, which represents the document's root element (usually the `html` element). this makes them globally accessible throughout your stylesheet.

using css variables

you can use the `var()` function to access the value of a css variable.

example: a simple web page

here’s a quick example of a simple web page using css variables.

changing css variables with javascript

you can also update css variables dynamically using javascript. here’s a simple example:

summary

css variables are a powerful way to make your stylesheets more dynamic and easier to maintain. you can define them once and use them throughout your css, which makes updating styles a breeze. additionally, you can manipulate them with javascript for even more dynamic effects.

quick recap
- **define**: use `--variable-name` in a selector.
- **use**: access with `var(--variable-name)`.
- **dynamic**: change them with javascript.

with this knowledge, you're well on your way to leveraging css variables effectively in your projects! happy coding!

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