body {
font-family: Sans-serif;
    background-color: #222;
    color: #fff;
    margin: 0;
    padding: 0;
}

header {
    background-color: #444;
    padding: 10px;
    text-align: center;
}

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

nav ul li {
    display: inline;
    margin: 0 15px;
}

nav ul li a {
    color: #ffcc00;
    text-decoration: none;
}

nav ul li a:hover {
    text-decoration: underline;
}

h1, h2, h3 {
    color: #ffcc00;
}

section {
    margin: 20px;
    padding: 20px;
    border: 2px solid #ffcc00;
    border-radius: 10px;
}

img {
    max-width: 100%;
    height: auto;
    border: 2px solid #ffcc00;
}

footer {
    margin-top: 20px;
    text-align: center;
    border-top: 1px solid #444;
    padding-top: 10px;
}

audio {
    margin-top: 10px;
}

@media (max-width: 600px) {
    nav ul li {
        display: block;
        margin: 5px 0;
    }

    section {
        margin: 10px;
    }
}