#payment-button button {
  min-height: 64px;
  padding-right: 44px;
  padding-left: 44px;
  font-size: 18px;
  font-weight: 700;
}

@media (max-width: 639px) {
  #payment-button {
    width: calc(100vw - 32px);
    max-width: calc(100vw - 32px);
  }

  #payment-button button {
    width: 100%;
    min-width: 0;
    height: auto;
    min-height: 64px;
    padding: 14px 20px;
    font-size: 17px;
    line-height: 1.25;
    white-space: normal;
  }
}