* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: Arial, sans-serif;
  color: #333;
  line-height: 1.6;
  padding: 20px;
  background-color: #f4f4f9;
}

header {
  text-align: center;
  padding: 10px;
  background-color: #333;
  color: #fff;
}

nav {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  background: #555;
}

nav a {
  color: white;
  padding: 10px 15px;
  text-decoration: none;
}

nav a:hover {
  background-color: #444;
}

section {
  padding: 15px;
  margin: 10px 0;
  background: #fff;
  border-radius: 5px;
  box-shadow: 0 0 5px rgba(0, 0, 0, 0.1);
}

h2 {
  color: #333;
  border-bottom: 2px solid #ddd;
  padding-bottom: 5px;
}

footer {
  text-align: center;
  padding: 10px;
  background-color: #333;
  color: #fff;
  margin-top: 20px;
}