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

header {
  background-color: #1e90ff;
  color: white;
  padding: 1em;
  text-align: center;
}

nav ul {
  list-style-type: none;
  padding: 0;
  background-color: #333;
  overflow: hidden;
}

nav ul li {
  display: inline;
  padding: 14px 20px;
}

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

nav ul li a:hover {
  background-color: #575757;
}

main {
  padding: 20px;
}

footer {
  background-color: #1e90ff;
  color: white;
  text-align: center;
  padding: 10px;
}