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<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0"/> <title>Multiplication Tables 1–20 Quiz</title> <style> body { font-family: Arial, Helvetica, sans-serif; background-color: #f0f4f8; margin: 0; padding: 20px; text-align: center; } .container { max-width: 500px; margin: 0 auto; background: white; padding: 30px; border-radius: 12px; box-shadow: 0 4px 15px rgba(0,0,0,0.1); } h1 { color: #2c3e50; margin-bottom: 10px; } #question { font-size: 2.2re...