How to add an extra class for submit button?

[Racterrus]

I use invisible recaptcha, so I create a submit button using {!! NoCaptcha::displaySubmit('my-form-id', 'submit now!', ['data-theme' => 'dark']) !!} As a result i have: <button data-callback="onSubmitloginform" data-sitekey="xxxxxxAAIjtNYEnJiXvwvofhxxxxxxxxxl" class="g-recaptcha"><span>submit now!</span></button> But I have to add additional classes to make a proper style, like <button data-callback="onSubmitloginform" data-sitekey="xxxxxxAAIjtNYEnJiXvwvofhxxxxxxxxxl" class="g-recaptcha class1 class2 class3 btn btn-primary"><span>submit now!</span></button>

How can I do it?

[adrianriyadi]

just use something like this and that's gonna work: {!! NoCaptcha::displaySubmit('my-form-id', 'submit now!', ['class' => 'class1 class2 class3 btn btn-primary']) !!}