Fix typo

Author: aarongarciah

packages/pigment-css-react/README.md

@@ -814,7 +814,7 @@ const Flex = styled('div')((props) => ({
 
 2. **Programatically generated styles**
 
-For Emotion and styled-components, the styles is different on each render and instance because the styles are generated at runtime:
+For Emotion and styled-components, the styles are different on each render and instance because the styles are generated at runtime:
 
 ```js
 function randomBetween(min: number, max: number) {