body {
  background-color: black;
  color: #1d546d;
  font-family: "Courier New";

  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.mainBox {
  background-color: #f3f4f4;
  width: fit-content;
  border-radius: 30px;
}

.headBox {
  text-align: center;
  background-color: beige;
  border-top-right-radius: 30px;
  border-top-left-radius: 30px;
}

.headBox h1 {
  margin: 0;
}

.bodyBox {
  width: 600px;
  padding-left: 60px;
  padding-top: 20px;
  padding-bottom: 20px;
}

select {
  width: 250px;
  padding: 10px;
  border-radius: 10px;
  border: 1px solid #ccc;
  background-color: white;
  font-size: 16px;
  cursor: pointer;
  text-align: center;
}

.hidden {
  display: none;
}

input {
  margin-top: 20px;
  width: 250px;
  padding: 10px;
  border-radius: 10px;
  border: 1px solid #ccc;
  background-color: white;
  font-size: 16px;
  cursor: pointer;
  text-align: center;
}

#calculateButton {
  display: block;
  margin-top: 50px;
  width: 250px;
  height: 50px;
}