<button class="radikalwp-btn-pulse"><span class="radikalwp-btn-pulse-r"><//span>پخش زنده<//button>

.radikalwp-btn-pulse {
  position: relative;
  padding: 12px 30px;
  font-family: inherit;
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  background: #ef4444;
  border: none;
  border-radius: 999px;
  cursor: pointer;
}
.radikalwp-btn-pulse-r {
  position: absolute;
  inset: 0;
  border-radius: 999px;
  border: 2px solid #ef4444;
  animation: radikalwp-pulse-ring 1.8s ease-out infinite;
  pointer-events: none;
}
@keyframes radikalwp-pulse-ring {
  from { transform: scale(1); opacity: .8; }
  to { transform: scale(1.55); opacity: 0; }
}