Kinda Crappy 3D button code

HTML

<a href="#!" class="btn-3d">Button 3D</a>
<div class="btn-3d">Button 3D</div>

CSS

.btn-3d {
  position: relative;
  padding: 10px 20px;
  color: #fff;
  background-color: #0077cc;
  border: none;
  cursor: pointer;
  display:inline-block;
}
.btn-3d:before {
  content: "";
  position: absolute;
  top: 100%;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: #005599;
  transform: translateY(-100%);
  transition: transform 0.3s;
}
.btn-3d:hover:before {
  transform: translateY(0);
}