body {
  background: #f2f2f2;
  font-family: monospace;
  color: #111;
  margin: 0;
  padding: 0;
}

.container {
  width: 800px;
  margin: auto;
  padding: 20px;
}

header {
  text-align: center;
  padding: 20px;
}

nav {
  text-align: center;
  margin-bottom: 20px;
}

nav a {
  margin: 0 10px;
  text-decoration: none;
  color: black;
  font-weight: bold;
}

.box {
  background: white;
  border: 1px solid black;
  padding: 15px;
  margin-bottom: 15px;
}

footer {
  text-align: center;
  margin-top: 30px;
  font-size: 12px;
}