Ans is JavaScript
With React Native,you just style your application using JavaScript and you do not use a special language or syntax for defining styles. All of the React Native components accept a prop named style.
The style names and values usually match how CSS works on the web application, except names are written using camel casing, e.g backgroundColor rather than background-color.With React Native, you just style your application using JavaScript
Styling in React Native
React Native borrows many ideas of styling for the Web. For example, in CSS, you write the following: