metamask-extension/ui/components/app/collectible-options/index.scss

.collectible-options {
  &__button {
    font-size: $font-size-paragraph;
    color: var(--Black-100);
    background-color: inherit;
    padding: 2px 0 2px 8px;
  }

  &__icon {
    font-weight: 900;
  }
}