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

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

nav a {
    margin-right: 10px;
    text-decoration: none;
}

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

li {
    padding: 6px 0;
    border-bottom: 1px solid #ddd;
}

button {
    margin-top: 10px;
    padding: 8px 12px;
}