body {
  font-family: Arial, sans-serif;
  background-color: #f4f4f4;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  margin: 0;
}

.container {
  background-color: white;
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  width: 100%;
  max-width: 400px;
}

h1 {
  text-align: center;
  color: #333;
}

.input-group {
  margin-bottom: 15px;
  display: flex;
  gap: 10px;
  align-items: center;
}

label {
  display: block;
  margin-bottom: 5px;
  color: #555;
}

input, select {
  width: 100%;
  padding: 8px;
  border: 1px solid #ccc;
  border-radius: 4px;
  box-sizing: border-box;
}

input {
  flex: 2;
}

select {
  flex: 1;
}

input:focus, select:focus {
  outline: none;
  border-color: #007bff;
}

.button-group {
  display: flex;
  gap: 10px;
  margin-bottom: 15px;
}

button {
  flex: 1;
  padding: 10px;
  background-color: #007bff;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

button:hover {
  background-color: #0056b3;
}

.error {
  color: red;
  text-align: center;
  margin-top: 10px;
}

.results {
  margin-top: 20px;
  padding: 10px;
  background-color: #f9f9f9;
  border-radius: 4px;
  text-align: center;
}

.results p {
  margin: 5px 0;
  color: #333;
}

.notification {
  margin-top: 10px;
  padding: 10px;
  border-radius: 4px;
  text-align: center;
  font-weight: bold;
}

.notification.profit {
  background-color: #d4edda;
  color: #155724;
}

.notification.loss {
  background-color: #f8d7da;
  color: #721c24;
}

.back-button {
  display: block;
  text-align: center;
  margin-top: 20px;
  color: #007bff;
  text-decoration: none;
  font-weight: bold;
}

.back-button:hover {
  color: #0056b3;
}