text: import React, { Component } from 'react';
  
  class Button extends Component {
    render() {
      return (
        <button className={`button ${this.props.className || ''} ${this.props.selected ? 'selected' : ''}`}
                onClick={this.props.onClick}>
                {this.props.children}
        </button>
      )
    }
  }
  
  export default Button;
  