* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
}

.container {
    max-width: 600px;
    margin: 50px auto;
    padding: 20px;
    background-color: #fff;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

h2 {
    text-align: center;
    margin-bottom: 20px;
}

.form-group {
    margin-bottom: 15px;
}

label {
    font-weight: bold;
}

input[type="number"] {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
}

button[type="submit"] {
    width: 100%;
    padding: 10px;
    background-color: #007bff;
    border: none;
    color: #fff;
    border-radius: 5px;
    cursor: pointer;
}

button[type="submit"]:hover {
    background-color: #0056b3;
}

#result {
    margin-top: 20px;
    text-align: center;
}