<button class="radikalwp-btn-edgeglow">بیشتر بدانید<//button>

.radikalwp-btn-edgeglow {
  padding: 13px 36px;
  font-family: inherit;
  font-size: 15px;
  font-weight: 700;
  color: #c4b5fd;
  background: #17103a;
  border: 1.5px solid #312e81;
  border-radius: 12px;
  cursor: pointer;
  transition: border-color .3s ease, box-shadow .3s ease, color .3s ease, text-shadow .3s ease;
}
.radikalwp-btn-edgeglow:hover {
  color: #ede9fe;
  border-color: #8b5cf6;
  box-shadow: 0 0 0 1px #8b5cf6, 0 0 24px rgba(139, 92, 246, .55), inset 0 0 14px rgba(139, 92, 246, .2);
  text-shadow: 0 0 10px rgba(237, 233, 254, .6);
}