<button class="radikalwp-btn-shine">خرید اشتراک<//button>

.radikalwp-btn-shine {
  position: relative;
  padding: 14px 34px;
  font-size: 16px;
  font-family: inherit;
  font-weight: bold;
  color: #fff;
  background: #2563eb;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  overflow: hidden;
}
.radikalwp-btn-shine::after {
  content: '';
  position: absolute;
  top: 0; left: -100%;
  width: 60%; height: 100%;
  background: linear-gradient(105deg, transparent, rgba(255,255,255,.45), transparent);
  transition: left .5s ease;
}
.radikalwp-btn-shine:hover::after { left: 130%; }