body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    font-family: Arial, sans-serif;
    background-color: #f0f2f5;
}

.form-container {
    background: #fff;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 400px;
    text-align: center;
    box-sizing: border-box;
}

form {
    display: flex;
    flex-direction: column;
}

h2 {
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
    color: #333;
}

.input-group {
    margin-bottom: 1rem;
    text-align: left;
}

label {
    margin-bottom: 0.5rem;
    font-weight: bold;
    display: block;
    color: #555;
}

input[type="text"], input[type="number"] {
    padding: 0.75rem;
    margin-bottom: 0.5rem;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 1rem;
    width: 100%;
    box-sizing: border-box;
}

input[type="text"]:focus, input[type="number"]:focus {
    border-color: #4CAF50;
    outline: none;
}

.error-message, .success-message {
    font-size: 0.875rem;
    margin-top: 1rem;
}

.error-message p, .success-message p {
    margin: 0;
    font-weight: bold;
}

.error-message {
    color: red;
}

.success-message {
    color: green;
}

pre {
    background-color: #f0f2f5;
    padding: 1rem;
    border-radius: 4px;
    text-align: left;
    overflow-x: auto;
}

.submit-button {
    padding: 0.75rem;
    border: none;
    border-radius: 4px;
    background-color: #4CAF50;
    color: white;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.submit-button:hover {
    background-color: #45a049;
}