body {
    font-family: Arial, sans-serif;
    background-color: #f0f2f5;
    padding: 20px;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    background-color: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
    margin-bottom: 20px;
}

label {
    margin-right: 10px;
}

input[type="number"] {
    width: 80px;
    padding: 5px;
    margin: 5px 0;
}

button {
    padding: 8px 16px;
    margin-top: 10px;
    cursor: pointer;
}

#result {
    margin-top: 20px;
    padding: 10px;
    background-color: #e8f5e9;
    border: 1px solid #c8e6c9;
    border-radius: 5px;
}