.product-form__cart-submit { background-color: red; border: 2px solid green; color: white; } .shopify-payment-button__button.shopify-payment-button__button--unbranded { background-color: green !important; border: 2px solid red !important; color: white !important; } /* Hover */ .shopify-payment-button__button.shopify-payment-button__button--unbranded:hover { background-color: blue !important; border: 2px solid orange !important; color: green !important; }