body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
}

header {
    background: #333;
    color: #fff;
    padding: 1rem 0;
    text-align: center;
}

nav ul {
    background: #444;
    list-style: none;
    padding: 0;
    display: flex;
    justify-content: center;
    margin: 0;
}

nav ul li {
    margin: 0;
}

nav ul li a {
    color: #fff;
    text-decoration: none;
    padding: 1rem;
    display: block;
}

nav ul li a:hover {
    background: #555;
}

main {
    padding: 2rem;
}

section {
    margin-bottom: 2rem;
}

button {
    background-color: #007BFF;
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    cursor: pointer;
}

button:hover {
    background-color: #0056b3;
}

footer {
    text-align: center;
    background: #333;
    color: #fff;
    padding: 1rem 0;
    position: fixed;
    bottom: 0;
    width: 100%;
}