**Only available in MM versions 2.3.2+

This new integration will allow the ability to define css in existing style sheets or in style tags. The following css styles are supported (as defined by Stripe): 

font-family, font-size, font-smoothing, font-style, font-variant, font-weight, icon-color, line-height, letter-spacing, text-align, text-decoration, text-shadow, text-transform, and color.

You can further define each action as a style in the #[div-id] .mm-stripe-elements-container .[action] where [div-id] can be #mm_field_cc_number_div, #mm_field_cc_cvv_div, or #mm_field_cc_exp_div and action can be base, invalid, or complete.

Ex:

#mm_field_cc_number_div .mm-stripe-elements-container .complete {
    font-size: 42px;
    font-family: Verdana;
    color: yellow;
    line-height: 50px;
}