text: import React from 'react';
  import PropTypes from 'prop-types';
  import { withStyles } from '@material-ui/core/styles';
  import Slider from '@material-ui/lab/Slider';
  
  const styles = {
    root: {
      display: 'flex',
      height: 300,
    },
  };
  
  class VerticalSlider extends React.Component {
    state = {
      value: 50,
    };
  
    handleChange = (event, value) => {
      this.setState({ value });
    };
  
    render() {
      const { classes } = this.props;
      const { value } = this.state;
  
      return (
        <div className={classes.root}>
          <Slider value={value} onChange={this.handleChange} vertical />
        </div>
      );
    }
  }
  
  VerticalSlider.propTypes = {
    classes: PropTypes.object.isRequired,
  };
  
  export default withStyles(styles)(VerticalSlider);
  