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

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

header nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: space-between;
}

header nav ul li {
    margin: 0 10px;
}

header nav a {
    color: #fff;
    text-decoration: none;
}

section {
    padding: 2em;
    margin-bottom: 2em;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

h1, h2 {
    color: #333;
}

h1 {
    font-size: 24px;
}

h2 {
    font-size: 18px;
}

button {
    background-color: #333;
    color: #fff;
    border: none;
    padding: 10px 20px;
    cursor: pointer;
}

button:hover {
    background-color: #444;
}

footer {
    background-color: #333;
    color: #fff;
    padding: 1em;
    text-align: center;
}

footer p {
    font-size: 14px;
}