DBA Yan Spinelli body { font-family: Arial, sans-serif; margin: 0; padding: 0; } header { background: #1a1a1a; padding: 20px; color: #fff; text-align: center; } nav a { margin: 0 15px; color: #fff; text-decoration: none; } section { padding: 60px 20px; } .container { max-width: 1100px; margin: auto; } footer { background: #111; color: #ccc; text-align: center; padding: 20px; }