body { font-family: Arial, sans-serif; padding: 20px; }
nav a { margin-right: 10px; }
.container { max-width: 700px; margin: 10px auto; }
.error { color: #b00020; }
.success { color: #007b00; }
.question { border-bottom: 1px solid #eee; padding: 10px 0; }