body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 20px;
}

h1 {
    text-align: center;
}

div {
    margin-bottom: 10px;
}

label {
    display: inline-block;
    width: 150px;
}

input[type="number"] {
    width: 60px;
    padding: 5px;
    font-size: 16px;
}

button {
    padding: 10px 20px;
    font-size: 16px;
    background-color: #007bff;
    color: #fff;
    border: none;
    cursor: pointer;
}

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

#total {
    margin-top: 20px;
    font-size: 18px;
    font-weight: bold;
}