body {
    font-family: Arial, sans-serif;
    margin: 20px;
}

form {
    max-width: 400px;
    margin: 0 auto;
}

input, button {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
}

ul {
    list-style-type: none;
    padding: 0;
}

li {
    background: #f9f9f9;
    padding: 10px;
    margin: 5px 0;
    border: 1px solid #ddd;
}