body {
  font-family: "Tahoma", sans-serif;
  background: #f7f7f7;
  margin: 0;
  padding: 0;
}

header {
  background: #0067a3;
  color: white;
  padding: 20px;
  text-align: center;
}

nav a {
  color: white;
  margin: 0 10px;
  text-decoration: none;
}

main {
  padding: 20px;
}

.posts article {
  background: white;
  padding: 15px;
  margin-bottom: 15px;
  border-radius: 6px;
}

footer {
  background: #333;
  color: #ddd;
  padding: 15px;
  text-align: center;
}