body {
  font-family: Arial, sans-serif;
  margin: 40px;
  background-color: #f9f9f9;
  color: #333;
}
header {
  text-align: center;
  margin-bottom: 40px;
}
h1 {
  font-size: 2.5em;
  margin-bottom: 0.2em;
}
h2 {
  font-size: 1.5em;
  color: #555;
}
section {
  max-width: 700px;
  margin: auto;
  background: #fff;
  padding: 30px;
  border-radius: 8px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
a {
  color: #0073b1;
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}
ul {
  list-style-type: disc;
  padding-left: 20px;
}
nav {
  background-color: #333;
  padding: 1em;
  text-align: center;
  margin-bottom: 20px;
}
nav a {
  color: white;
  margin: 0 1em;
  font-weight: bold;
}
nav a:hover {
  text-decoration: underline;
}