body {
  font-family: sans-serif;
  background: #f5f5f5;
  margin: 0;
  padding: 0;
}
header {
  background: #222;
  color: white;
  padding: 2em;
  text-align: center;
}
.video-gallery {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  padding: 2em;
}
.video-item {
  margin: 1em;
  max-width: 480px;
}
video {
  width: 100%;
  border-radius: 8px;
}
footer {
  background: #333;
  color: white;
  text-align: center;
  padding: 1em;
}