sc-product-donation-custom-amount sc-price-input sc-button {
  margin-right: -10px !important;
}

.sc-product-donation-custom-amount sc-button {
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--sc-transition-fast) ease-in-out, visibility var(--sc-transition-fast) ease-in-out;
}
.sc-product-donation-custom-amount--has-value sc-button {
  opacity: 1;
  visibility: visible;
}