PROMO BANNER BUTTON

Hello,

To make the button on the promo popup transparent Please add the following Custom CSS in the Global Custom CSS area under Theme Settings >> Custom CSS.

While making it transparent you need to also move the button to the right side to make it look good.

.mc4wp-form input[type="submit"] {
background: transparent;
margin-left: 32px;
border: 1px solid white;
color: white;
}

You can adjust the values according to your needs.

Best Regards.