<button class="radikalwp-btn-3d">فشار بده<//button>

.radikalwp-btn-3d {
  padding: 13px 34px; border: 0; border-radius: 14px; cursor: pointer;
  background: #0ea5e9; color: #fff; font-size: 14px; font-weight: 800; font-family: inherit;
  box-shadow: 0 6px 0 #0369a1, 0 10px 18px rgba(14,165,233,.35);
  transition: transform .12s, box-shadow .12s;
}
.radikalwp-btn-3d:active { transform: translateY(5px); box-shadow: 0 1px 0 #0369a1, 0 3px 8px rgba(14,165,233,.3); }