define style in js material-ui code example

Example 1: material ui common styles

const useStyles = makeStyles({
  root: {
    color: 'red',
    '& p': {
      color: 'green',
      '& span': {
        color: 'blue'
      }
    }
  },
});

Example 2: material ui common styles

// Re-export with a default theme
import { makeStyles } from '@material-ui/core/styles';

// Original module with no default theme
import { makeStyles } from '@material-ui/styles';