<button class="radikalwp-btn-flip" data-alt="بزن بریم!"><span>دانلود قالب<//span><//button>

.radikalwp-btn-flip {
  position: relative;
  padding: 13px 32px;
  font-family: inherit;
  border: 2px solid #10b981;
  background: transparent;
  border-radius: 10px;
  cursor: pointer;
  overflow: hidden;
}
.radikalwp-btn-flip span {
  display: block;
  font-size: 16px;
  font-weight: 700;
  color: #10b981;
  transition: transform .3s ease;
}
.radikalwp-btn-flip::after {
  content: attr(data-alt);
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: inherit;
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  background: #10b981;
  transform: translateY(100%);
  transition: transform .3s ease;
}
.radikalwp-btn-flip:hover span { transform: translateY(-120%); }
.radikalwp-btn-flip:hover::after { transform: translateY(0); }