<button class="radikalwp-btn-ticket">کد تخفیف: RWP20<//button>

.radikalwp-btn-ticket {
  padding: 14px 30px;
  font-family: inherit;
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  border: none;
  cursor: pointer;
  background:
    linear-gradient(135deg, #f43f5e, #fb7185);
  -webkit-mask: radial-gradient(7px at 7px 50%, transparent 96%, #000) right / 51% 100% no-repeat,
    radial-gradient(7px at calc(100% - 7px) 50%, transparent 96%, #000) left / 51% 100% no-repeat;
  mask: radial-gradient(7px at 7px 50%, transparent 96%, #000) right / 51% 100% no-repeat,
    radial-gradient(7px at calc(100% - 7px) 50%, transparent 96%, #000) left / 51% 100% no-repeat;
  transition: filter .3s ease;
}
.radikalwp-btn-ticket:hover { filter: brightness(1.12); }