Add CSS class to form element

This requires adding code to your functions.php file. Find out how to do this here

You can add or remove CSS classes to the HTML element containing the sign-up form using the `mc4wp_form_css_classes` filter hook.

If we wanted to add a `form-inline` class to the form, we can use the following code:

add_filter( 'mc4wp_form_css_classes', function( $classes ) { 
	$classes[] = 'form-inline';
	return $classes;

The above example adds the `form-inline` class which is used by Bootstrap. Please note that this filter adds the classes to the `<div>` element containing the `form` element, not to the form element itself. If you want to add an ID to the form itself, you will need to add a little bit of information to your shortcode.

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