material ui how to use theme variable prop code example

Example 1: themein material ui

import { createMuiTheme } from '@material-ui/core/styles';
import purple from '@material-ui/core/colors/purple';
import green from '@material-ui/core/colors/green';

const theme = createMuiTheme({
  palette: {
    primary: purple,
    secondary: green,
  },
  status: {
    danger: 'orange',
  },
});

Example 2: use theme in component mui

import React from "react";
import { makeStyles } from "@material-ui/core/styles";

const useStyles = makeStyles((theme) => ({
  root: {
    backgroundColor: theme.palette.secondary.main
  }
}));

export default function App() {
  const classes = useStyles();
  return (
    <div className={classes.root}>
      <h1>Hello CodeSandbox</h1>
      <h2>Start editing to see some magic happen!</h2>
    </div>
  );
}