body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f4f7fa;
  color: #333;
}
header {
  background-color: #003366;
  padding: 20px;
  color: white;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
nav a {
  color: white;
  margin-left: 15px;
  text-decoration: none;
  font-weight: bold;
}
.logo {
  height: 50px;
}
main {
  padding: 20px;
}
footer {
  background-color: #003366;
  color: white;
  text-align: center;
  padding: 15px;
  margin-top: 30px;
}