content: import React from 'react';
  import PropTypes from 'prop-types';
  import { withStyles, createStyleSheet } from 'material-ui/styles';
  import { CircularProgress } from 'material-ui/Progress';
  
  const styleSheet = createStyleSheet((theme) => ({
    root: {
      display: 'flex',
      justifyContent: 'center'
    }
  }));
  
  const CircularIndeterminate = (props) => {
    const classes = props.classes;
  
    return (
      <div className={classes.root}>
        <CircularProgress size={props.size} />
      </div>
    );
  };
  
  CircularIndeterminate.propTypes = {
    classes: PropTypes.object.isRequired,
    size: PropTypes.number
  };
  
  CircularIndeterminate.defaultProps = {
    size: 50
  };
  
  export default withStyles(styleSheet)(CircularIndeterminate);
  