button {
  background-color: #4CAF50; /* Green */
  border: none;
  color: white;
  padding: 0.5vw 0.5vw;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 1vw;
}
@media (orientation: portrait) {
  button{
    padding: 2vw 2vw;
    font-size: 2vh;
  }
}
button:hover {
  background-color: #2b632d;
  color: white;
}