.bonc-container {
    max-width: 400px;
    margin: auto;
    padding: 20px;
    border: 1px solid #ddd;
    border-radius: 5px;
    background: #f9f9f9;
    text-align: center;
    font-family: Arial, sans-serif;
}

.bonc-container h2 {
    font-size: 20px;
    margin-bottom: 15px;
}

.bonc-container select,
.bonc-container input {
    width: 100%;
    padding: 8px;
    margin: 10px 0;
}

.bonc-container button {
    background: #007bff;
    color: white;
    padding: 10px;
    border: none;
    cursor: pointer;
    width: 100%;
    font-size: 16px;
}

.bonc-container button:hover {
    background: #0056b3;
}

#big_o_result {
    font-weight: bold;
    font-size: 18px;
    color: #333;
}