body {
  font-family: sans-serif;
  margin: 0;
  padding: 0;
  text-align: center;
  background: #f8f9fa;
  color: #333;
}

header {
  background: #0078d7;
  color: white;
  padding: 1em;
}

main {
  padding: 2em;
}

img, video {
  margin-top: 1em;
  border-radius: 8px;
  max-width: 100%;
  height: auto;
}

footer {
  margin-top: 2em;
  padding: 1em;
  background: #eee;
  font-size: 0.9em;
}