body {
  font-family: 'Segoe UI', sans-serif;
  margin: 0;
  background-color: #f7f9fc;
  color: #333;
}
header {
  background-color: #2c3e50;
  color: #fff;
  padding: 20px;
  text-align: center;
}
nav {
  background-color: #34495e;
  display: flex;
  justify-content: center;
}
nav a {
  color: white;
  text-decoration: none;
  padding: 14px 20px;
  display: block;
}
nav a:hover {
  background-color: #2c3e50;
}
main {
  max-width: 900px;
  margin: 40px auto;
  padding: 0 20px;
}
footer {
  text-align: center;
  padding: 20px;
  background-color: #ddd;
  font-size: 0.9rem;
}
h2 {
  border-bottom: 2px solid #ccc;
  padding-bottom: 10px;
  color: #2c3e50;
}
ul {
  list-style: none;
  padding: 0;
}
ul li {
  margin-bottom: 20px;
}
a {
  color: #007acc;
}