css
body {
    background-color: #f4f1ea;
    color: #222222;
    font-family: Arial, Helvetica, sans-serif;
    margin: 10px;
}

header {
    background-color: #2f2f2f;
    color: white;
    text-align: center;
    padding: 20px;
}

h1 {
    text-align: center;
    margin: 0;
    font-size: 2.5em;
}

header h2 {
    margin-top: 10px;
    font-size: 1.2em;
    font-weight: normal;
}

nav {
    text-align: center;
    background-color: #d9d2c3;
    padding: 10px;
}

nav p {
    margin: 0;
}

nav a {
    color: #000000;
    text-decoration: none;
    font-weight: bold;
    margin: 0 10px;
}

nav a:hover {
    color: #8b0000;
    text-decoration: underline;
}

main {
    width: 80%;
    margin: auto;
    padding: 20px;
    background-color: white;
}

h3,
main h2 {
    color: #8b0000;
    text-align: center;
}

p {
    line-height: 1.6em;
    margin-bottom: 20px;
}

figure {
    text-align: center;
    margin: 20px auto;
}

figcaption {
    font-style: italic;
    margin-top: 8px;
}

footer {
    text-align: center;
    padding: 15px;
    background-color: #2f2f2f;
    color: white;
}

#validation a {
    color: white;
    text-decoration: none;
    font-weight: bold;
}

#validation a:hover {
    text-decoration: underline;
}

.media-block {
    text-align: center;
    margin-top: 20px;
    margin-bottom: 30px;
}

.video-frame {
    border: 0;
    max-width: 100%;
}