.button-3d {
  display: inline-block;
  padding: 0.5em 1em;
  font-size: 1.06em;
  font-weight: bold;
  text-transform: uppercase;
  color: #fff;
  background-color: #8e44ad;
  border: none;
  border-radius: 0.25em;
  box-shadow: 0 0.15em 0.3em rgba(0, 0, 0, 0.3);
  transform: perspective(1em) rotateX(-1deg) rotateY(1deg);
  transition: all 0.2s ease-in-out;
}

.button-3d:hover {
  transform: perspective(1em) rotateX(-3deg) rotateY(3deg) translateY(-0.05em);
  background-color: #9b59b6;
  box-shadow: 0 0.3em 0.6em rgba(0, 0, 0, 0.3);
}

.button-3d:focus,
.button-3d:active {
  transform: perspective(1em) rotateX(-3deg) rotateY(3deg) translateY(-0.05em);
  background-color: #e74c3c;
  box-shadow: 0 0.3em 0.6em rgba(0, 0, 0, 0.3);
  outline: none;
}