body {
  margin: 0;
  font-family: Arial, sans-serif;
  background-color: #f4f4f4;
  color: #333;
}
header {
  background-color: #1b3a28;
  color: white;
  padding: 20px;
  text-align: center;
}
header img {
  max-width: 300px;
  margin-bottom: 10px;
}
nav {
  background-color: #333;
  text-align: center;
  padding: 10px 0;
}
nav a {
  color: white;
  margin: 0 15px;
  text-decoration: none;
  font-weight: bold;
}
main {
  padding: 20px;
}
footer {
  background-color: #222;
  color: white;
  text-align: center;
  padding: 10px;
  position: relative;
  bottom: 0;
  width: 100%;
}