<button class="radikalwp-btn-wave">ورود به حساب<//button>

.radikalwp-btn-wave {
  padding: 14px 34px;
  font-size: 16px;
  font-family: inherit;
  color: #a5b4fc;
  background: #1e1b4b;
  border: 1px solid #4338ca;
  border-radius: 12px;
  cursor: pointer;
  transition: all .3s ease;
  animation: radikalwp-pulse 2.5s ease-in-out infinite;
}
.radikalwp-btn-wave:hover {
  color: #fff;
  background: #312e81;
  box-shadow: 0 0 0 4px rgba(99, 102, 241, .25);
}
@keyframes radikalwp-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(99, 102, 241, .35); }
  50%      { box-shadow: 0 0 0 8px rgba(99, 102, 241, 0); }
}