body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f8f8f8;
  color: #333;
  line-height: 1.7;
}

header {
  background: #1877f2;
  color: white;
  padding: 15px 20px;
  text-align: center;
  font-size: 24px;
  font-weight: bold;
}

nav {
  background: #fff;
  padding: 10px 0;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
  text-align: center;
}

nav ul li {
  display: inline-block;
  margin: 0 15px;
}

nav ul li a {
  text-decoration: none;
  font-size: 16px;
  color: #1877f2;
  font-weight: bold;
}

.container {
  max-width: 900px;
  margin: 40px auto;
  background: white;
  padding: 25px;
  border-radius: 10px;
  box-shadow: 0 2px 15px rgba(0,0,0,0.1);
}

h1, h2 {
  color: #1877f2;
}

footer {
  text-align: center;
  padding: 20px;
  font-size: 14px;
  color: #666;
}