body {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  margin: 0;
  padding: 0;
  background: #f9f9f9;
  color: #333;
}
header, footer {
  background: #2A6DFF;
  color: white;
  padding: 10px 20px;
}
nav a {
  color: white;
  margin-right: 10px;
  text-decoration: none;
}
main {
  padding: 20px;
  background: white;
  margin: 10px;
  border-radius: 5px;
  box-shadow: 0 0 5px rgba(0,0,0,0.1);
}
footer {
  text-align: center;
  font-size: 0.9em;
}