#start-button {
  border: 2px solid #4caf50;
  border-radius: 15px;
  color: #4caf50;
  font-weight: bold;
  background-color: white;
  padding: 16px 32px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  transition-duration: 0.4s;
  cursor: pointer;
}

#start-button:hover,
#start-button:focus {
  background-color: #4caf50;
  color: white;
}