body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 1rem;
  line-height: 1.6;
  background-color: lightgrey;
}

header {
  text-align: center;
  padding: 1rem;
}

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

nav ul li {
  margin: 0.5rem 0;
}

a {
  text-decoration: none;
  color: #0073e6;
}

a:hover {
  text-decoration: underline;
}

section {
  margin: 1.5rem 0;
}

.video-container {
  margin-bottom: 1rem;
}