body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f4f4f4;
  color: #333;
}

header {
  background-color: #333;
  color: #fff;
  padding: 20px;
  text-align: center;
}

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

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

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

section {
  padding: 20px;
  margin: 10px auto;
  max-width: 800px;
  background-color: #fff;
  border-radius: 10px;
}

h2 {
  color: #444;
}

.github-container iframe {
  width: 100%;
  height: 400px;
}

footer {
  background-color: #333;
  color: #fff;
  text-align: center;
  padding: 10px;
}