body {
  font-family: Arial, sans-serif;
  background-color: #f5f5f5;
}

h1 {
  text-align: center;
  margin-top: 50px;
  margin-bottom: 20px;
}

.container {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
}

form {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  background-color: #fff;
  border-radius: 10px;
  padding: 20px;
  box-shadow: 0px 0px 10px 0px rgba(0, 0, 0, 0.2);
}

form label,
form input,
form select {
  font-size: 20px;
  margin: 5px;
}

form select {
  padding: 5px;
  border: none;
  background-color: #f5f5f5;
  border-radius: 5px;
}

form input[type="submit"] {
  background-color: #4CAF50;
  color: #fff;
  border: none;
  padding: 10px 20px;
  text-decoration: none;
  border-radius: 5px;
  cursor: pointer;
  transition: background-color 0.3s ease-in-out;
}

form input[type="submit"]:hover {
  background-color: #3e8e41;
}

#result {
  font-size: 30px;
  margin: 20px 0;
  text-align: center;
}