content: import React from 'react';
  import PropTypes from 'prop-types';
  import { withStyles } from 'material-ui/styles';
  import { CircularProgress } from 'material-ui/Progress';
  import purple from 'material-ui/colors/purple';
  
  const styles = theme => ({
    progress: {
      margin: theme.spacing.unit * 2
    }
  });
  
  const LoadingSpinner = props => {
    const { classes } = props;
    return (
      <div>
        <CircularProgress className={classes.progress} thickness={7} />
      </div>
    );
  };
  
  LoadingSpinner.propTypes = {
    classes: PropTypes.object.isRequired
  };
  
  export default withStyles(styles)(LoadingSpinner);
  