render() {
    const {children, isOpen, width, className} = this.props;
    return (
      <Container isOpen={isOpen} width={width} className={className}>
        <IconButton onClick={this._onClose}>
          <StyledIcon as={Cancel} height="10" width="10" color="#aaa" />
        </IconButton>
        {children}
      </Container>
    );
  }
Callback on toggle open the side bar.