body {
    font-family: Arial, sans-serif;
    text-align: center;
    background-color: #f0f0f0;
}

.calculator {
    background-color: #fff;
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.2);
    width: 300px;
    margin: 0 auto;
}

.result {
    background-color: #fff;
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.2);
    width: 300px;
    margin: 20px auto;
}

h1 {
    font-size: 24px;
    margin-bottom: 20px;
}

label, input, select {
    display: block;
    margin: 10px 0;
}

button {
    background-color: #0074d9;
    color: #fff;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    margin-right: 10px;
}

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