Untitled

<style>
.shopify-payment-button .shopify-payment-button__button--unbranded {
    position: relative;
}
.shopify-payment-button .shopify-payment-button__button--unbranded:after {
    content: "Change Buy Button Text";
    background: inherit;
    font-size: inherit;
    color: inherit;
    height: 100%;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    position: absolute;
    top: 0;
    left: 0;
}
</style>