a {
  display: block;
  width: 180px;
  height: 50px;
  margin-top: 15px;
  text-decoration: none;
}

button {
  width: 100%;
  height: 100%;
  background-color: gray;
  color: white;
  border: none;
  cursor: pointer;
}

button:hover {
  background-color:black;
}