body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f5f7fa;
  color: #222;
}

header {
  background: #1e3a8a;
  color: white;
  padding: 15px;
  text-align: center;
}

nav {
  margin-top: 10px;
}

nav a {
  color: white;
  margin: 10px;
  text-decoration: none;
  font-weight: bold;
}

.container {
  padding: 30px;
  text-align: center;
}

.card {
  background: white;
  padding: 20px;
  margin: 15px auto;
  width: 320px;
  border-radius: 10px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.btn {
  display: inline-block;
  padding: 10px 15px;
  background: #1e3a8a;
  color: white;
  text-decoration: none;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  margin-top: 10px;
}