<button class="radikalwp-btn-shake">پیشنهاد ویژه!<//button>

.radikalwp-btn-shake {
  padding: 13px 30px;
  font-family: inherit;
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  background: #ef4444;
  border: none;
  border-radius: 10px;
  cursor: pointer;
}
.radikalwp-btn-shake:hover { animation: radikalwp-shake-move .5s ease-in-out; }
@keyframes radikalwp-shake-move {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-4px) rotate(-1deg); }
  40% { transform: translateX(4px) rotate(1deg); }
  60% { transform: translateX(-3px); }
  80% { transform: translateX(3px); }
}