body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f8f9fa;
}

nav {
    background-color: #333;
    padding: 10px;
    text-align: center;
}

nav a {
    color: white;
    text-decoration: none;
    padding: 10px 20px;
    display: inline-block;
}

nav a:hover {
    background-color: #575757;
}

main {
    padding: 20px;
    text-align: center;
}

.responsive-img {
    max-width: 100%; 
    height: auto; 
}

img {
    max-width: 50%; 
    height: auto; 
}

video, audio, iframe {
    max-width: 100%;
    display: block;
    margin: auto;
}

footer {
    background-color: #222;
    color: white;
    text-align: center;
    padding: 10px;
    margin-top: 20px;
}

@media (max-width: 768px) {
    nav a {
        display: block;
        margin: 10px 0;
    }
}