body {
    font-family: Arial, sans-serif;
    margin: 20px;
}
nav {
    margin-bottom: 20px;
}
nav a {
    margin-right: 10px;
    text-decoration: none;
    color: blue;
}
form {
    display: flex;
    flex-direction: column;
    max-width: 300px;
}
input, button {
    margin: 5px 0;
    padding: 5px;
}
ul {
    list-style: none;
    padding: 0;
}
li {
    margin: 5px 0;
}