body {
    font-family: Arial, sans-serif;
    max-width: 600px;
    margin: 20px auto;
    padding: 20px;
}

.calculator {
    border: 1px solid #ccc;
    padding: 20px;
    border-radius: 5px;
    background-color: #f9f9f9;
}

h2 {
    color: #2c3e50;
}

label {
    display: block;
    margin: 10px 0 5px;
    font-weight: bold;
}

input, select {
    width: 100%;
    padding: 8px;
    margin-bottom: 15px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

#total {
    font-size: 1.5em;
    margin-top: 20px;
    color: #27ae60;
    font-weight: bold;
}