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# `useCss`
React UI hook that changes [CSS dynamically][gen-5]. Works like "virtual CSS" —
it re-renders only CSS rules that change. It is different from inline styles, because
you can use media queries and pseudo selectors.
## Usage
```jsx
import {useCss} from 'react-use';
const Demo = () => {
const className = useCss({
color: 'red',
border: '1px solid red',
'&:hover': {
color: 'blue',
},
});
return (
<div className={className}>
Hover me!
</div>
);
};
```
## Examples
```js
const className = useCss({
color: 'tomato',
'&:hover': {
color: 'orange',
},
});
const className = useCss({
svg: {
fill: 'tomato',
},
'.global_class &:hover svg': {
fill: 'orange',
},
});
const className = useCss({
color: 'tomato',
'@media only screen and (max-width: 600px)': {
color: 'orange',
'&:hover': {
color: 'red',
}
},
});
```
[gen-5]: https://github.com/streamich/freestyler/blob/master/docs/en/generations.md#5th-generation
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