.mortgage-calculator {
    max-width: 400px;
    padding: 20px;
    border: 1px solid #ddd;
    background: #f9f9f9;
}
.mortgage-calculator label {
    display: block;
    margin-bottom: 10px;
}
#mortgageResult {
    margin-top: 15px;
    font-weight: bold;
}