body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    background-color: #333;
    color: #fff;
    padding: 10px 0;
    text-align: center;
}

nav ul {
    list-style-type: none;
    padding: 0;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
}

nav ul li {
    margin: 0 10px;
}

nav ul li a {
    color: #fff;
    text-decoration: none;
    padding: 10px 20px;
    background-color: #444;
    border-radius: 5px;
}

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

.contact-link {
    color: #ffcc00;
    font-weight: bold;
}

main {
    padding: 20px;
    flex: 1;
}

footer {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 10px 0;
    position: fixed;
    width: 100%;
    bottom: 0;
}

img {
    margin-top: 20px;
}

@media (max-width: 600px) {
    nav ul {
        flex-direction: column;
        align-items: center;
    }

    nav ul li {
        margin: 5px 0;
    }

    nav ul li a {
        display: block;
        width: 100%;
        text-align: center;
    }
}