rssv

[fast zenith]

var card_num = elements.create('cardNumber', {
    classes: {
        base: 'basic',
        focus: 'focus'
    },
    placeholder: 'Card number',
});
card_num.mount('#card_num');

https://stripe.com/docs/js/elements_object/create_element?type=card#elements_create-options

[slender skiff]

Correct, you'd style them with the style API: https://stripe.com/docs/js/appendix/style

[fast zenith]

Wait, I thought the reason why we're setting custom classes is due passthroughing styles from website to iframe

So we can't passthrough styles inside of class to iframe?

[slender skiff]

No