Send button size

Hi,
How can I simply change the send button size ?
I’ve added

function sendbutton_cf7_bootstrap( $properties ) {
		$properties['size'] = 'large';
		return $properties;
	}
	add_filter( 'cf7bs_default_form_properties', 'sendbutton_cf7_bootstrap' );

But it changes the size of all inputs.
Can we limite it to this button ?

https://www.ads-software.com/plugins/bootstrap-for-contact-form-7/