body {
  font-family: sans-serif;
  background-color: #f9f9f9;
  text-align: center;
  padding-top: 50px;
}
button {
  font-size: 1.5em;
  padding: 15px 30px;
  margin: 20px;
  background-color: #4CAF50;
  color: white;
  border: none;
  border-radius: 10px;
  cursor: pointer;
}
.resultat {
  margin-top: 30px;
  font-size: 1.4em;
  color: #333;
}