body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
}

header {
  background-image: url('img/banner3.png'); /* ensure the path is correct */
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  height: 420px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: white;
}

header img {
  max-height: 100px;
}

nav {
  background-color: #333;
  overflow: hidden;
}

nav a {
  float: left;
  display: block;
  color: white;
  text-align: center;
  padding: 14px 20px;
  text-decoration: none;
}

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

main {
  padding: 20px;
}

footer {
  background-color: #333;
  color: white;
  text-align: center;
  padding: 10px 0;
}