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

header {
  background-color: #4CAF50;
  padding: 20px;
  text-align: center;
  color: #fff;
}

.navbar {
  display: flex;
  background-color: #333;
  justify-content: center;
  padding: 10px;
}
.navbar a {
  color: #fff;
  padding: 14px 20px;
  text-decoration: none;
  text-align: center;
}
.navbar a:hover {
  background-color: #ddd;
  color: #000;
}
.navbar a.active {
  background-color: #4CAF50;
  color: #fff;
}

main {
  padding: 20px;
}

footer {
  background-color: #333;
  color: #fff;
  text-align: center;
  padding: 10px;
  position: fixed;
  width: 100%;
  bottom: 0;
}