.container {
  max-width: 400px;
  margin: auto;
  padding: 20px;
  background: #1e1e1e;
  color: #fff;
  font-family: sans-serif;
  border-radius: 12px;
  box-shadow: 0 0 10px rgba(255,255,255,0.1);
  text-align: center;
}

.container h2 {
  margin-bottom: 20px;
}

.container select,
.container input {
  width: 100%;
  padding: 10px;
  margin: 10px 0;
  background: #2c2c2c;
  color: #fff;
  border: none;
  border-radius: 6px;
  font-size: 16px;
}

.container .inputs {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.container .inputs span {
  font-size: 24px;
  font-weight: bold;
}

.container #result {
  margin-top: 15px;
  font-size: 18px;
  font-weight: bold;
}