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

.radikalwp-btn-shine {
  position: relative;
  padding: 13px 34px;
  border: none;
  border-radius: 12px;
  background: linear-gradient(135deg, #0f172a, #334155);
  cursor: pointer;
  overflow: hidden;
}
.radikalwp-btn-shine span {
  position: relative;
  z-index: 1;
  font-family: inherit;
  font-size: 16px;
  font-weight: 700;
  color: #fbbf24;
}
.radikalwp-btn-shine::after {
  content: '';
  position: absolute;
  top: 0;
  right: -80%;
  width: 45%;
  height: 100%;
  background: linear-gradient(100deg, transparent, rgba(255,255,255,.55), transparent);
  transform: skewX(-20deg);
  animation: radikalwp-shine-move 2.8s ease-in-out infinite;
}
@keyframes radikalwp-shine-move { 0%, 60% { right: -80%; } 100% { right: 140%; } }