Koopbuy Spreadsheet Budget Guide body { font-family: Arial, sans-serif; line-height: 1.6; margin: 20px; } .container { max-width: 800px; margin: 0 auto; } h1 { color: #2c3e50; border-bottom: 2px solid #3498db; padding-bottom: 10px; } h2 {… My Koopbuy Spreadsheet Budget Journey: How I Scored Air Force 1 Lows for Less