css button shadow

.button {
  box-shadow:3px 3px 12px gray;padding:3px;
  transition-duration: 0.4s;
  background-color: #13196e; /* Green */
  border: none;
  border-radius: 12px;
  color: white;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 1rem;
}