.button {
  border-radius: 4px;
  border: none;
  text-align: center;
  font-size: 14px;
  padding: 5px;
  width: 200px;
  transition: all 0.5s;
  cursor: pointer;
  margin: 5px;
}
.button span {
  cursor: pointer;
  display: inline-block;
  position: relative;
  transition: 0.5s;
}
.button span:after {
  position: absolute;
  opacity: 0;
  top: 0;
  right: -20px;
  transition: 0.5s;
}
.button:hover span {
  padding-right: 25px;
}
.button:hover span:after {
  opacity: 1;
  right: 0;
}
.button:active {
  background-color:transparent;
  box-shadow: 0 5px #666;
  transform: translateY(4px);
}