    style={buttonStyles}
                    >
                        {running ? 'Stop' : 'Start'}
                    </button>
                    <button
                        onClick={this.handleClearClick}
                        style={buttonStyles}
                    >
                        Clear
                    </button>
                </div>
            )
        }
    }

    const element = <StopWatch />
    ReactDOM.render(
        element,
        document.getElementById('root')
    )