material ui how to work themeBase and theme 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 class component material ui

import { withStyles } from "@material-ui/core/styles";

const styles = theme => ({
  root: {
    backgroundColor: "red"
  }
});

class ClassComponent extends Component {
  state = {
    searchNodes: ""
  };

  render() {
    const { classes } = this.props;
    return (
      <div className={classes.root}>Hello!</div>
    );
  }
}

export default withStyles(styles, { withTheme: true })(ClassComponent);