body {
    font-family: Arial, sans-serif;
    margin: 20px;
    padding: 20px;
    background-color: #f4f4f4;
    text-align: center;
}

h1, h2 {
    margin-bottom: 10px;
}

label, input, button {
    display: block;
    margin: 10px auto;
}

input {
    padding: 5px;
    font-size: 16px;
    width: 200px;
    text-align: center;
}

button {
    background-color: #008CBA;
    color: white;
    border: none;
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
}

button:hover {
    background-color: #005f75;
}

#result {
    font-size: 18px;
    margin-top: 20px;
}

ul {
    list-style-type: none;
    padding: 0;
    max-width: 400px;
    margin: 0 auto;
}

li {
    background: white;
    margin: 5px;
    padding: 10px;
    border-radius: 5px;
    cursor: pointer;
    transition: background 0.2s;
}

li:hover {
    background: #ddd;
}

footer {
    margin-top: 20px;
}