<button class="radikalwp-btn-layer">دانلود رایگان<//button>

.radikalwp-btn-layer {
  position: relative;
  padding: 13px 32px;
  font-family: inherit;
  font-size: 15px;
  font-weight: 700;
  color: #0f172a;
  background: #fde047;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  transition: transform .25s ease;
}
.radikalwp-btn-layer::after {
  content: '';
  position: absolute;
  inset: 0;
  background: #a855f7;
  border-radius: 12px;
  z-index: -1;
  transform: translate(0, 0);
  transition: transform .25s ease;
}
.radikalwp-btn-layer:hover { transform: translate(-3px, -3px); }
.radikalwp-btn-layer:hover::after { transform: translate(3px, 3px); }