Just in case anybody wants to change the color or radius of the “buy now” button on the ListingHive theme
.hp-listing--view-page .hp-form__button {
background-color:#ffb900;border-radius:3px
}
…and change the price text, color, size, weight
.hp-listing--view-page .hp-listing__attribute--price {
color: #ffb900; font-weight: bold; font-size: 24px !important;
}