body {
  margin: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #eef1f7;
  color: #333;
}
header {
  background: linear-gradient(to right, #004080, #0073e6);
  color: white;
  padding: 1.5rem;
  text-align: center;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}
nav {
  background-color: #005bb5;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  padding: 1rem;
  box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}
nav a {
  color: white;
  text-decoration: none;
  margin: 0.5rem;
  padding: 0.5rem 1rem;
  background-color: #0073e6;
  border-radius: 20px;
  transition: background 0.3s ease;
}
nav a:hover {
  background-color: #003f80;
}
main {
  max-width: 800px;
  margin: 2rem auto;
  background: white;
  padding: 2rem;
  border-radius: 15px;
  box-shadow: 0 8px 16px rgba(0,0,0,0.1);
}
.img {
  display: block;
  margin: 2rem auto; 
  width: 700px;
  height: 500px;
}