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

.calculator {
    background-color: #fff;
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
}

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

.form {
    margin-bottom: 30px;
}

h2 {
    font-size: 20px;
    margin-bottom: 10px;
}

label, input {
    display: block;
    margin-bottom: 10px;
}

input {
    width: 100%;
    padding: 8px;
    border: 1px solid #ccc;
    border-radius: 3px;
}

button {
    background-color: #007bff;
    color: #fff;
    border: none;
    padding: 10px 20px;
    border-radius: 3px;
    cursor: pointer;
    margin-right: 10px;
}

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

.result {
    font-weight: bold;
    margin-top: 20px;
}