<button class="radikalwp-btn-glass-dark">مشاهده دمو<//button>

.radikalwp-btn-glass-dark {
  padding: 13px 34px;
  font-family: inherit;
  font-size: 15px;
  font-weight: 700;
  color: #e2e8f0;
  background: rgba(15, 23, 42, .55);
  border: 1px solid rgba(148, 163, 184, .35);
  border-radius: 14px;
  cursor: pointer;
  backdrop-filter: blur(10px);
  box-shadow: 0 10px 28px rgba(2, 6, 23, .45), inset 0 1px 0 rgba(255, 255, 255, .08);
  transition: background .25s ease, color .25s ease, transform .2s ease;
}
.radikalwp-btn-glass-dark:hover {
  color: #fff;
  background: rgba(30, 41, 59, .75);
  transform: translateY(-2px);
}