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body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; margin: 20px; padding: 0; background-color: #f0f2f5; color: #333; } article { background-color: #ffffff; padding: 20px; margin-bottom: 20px; border-radius: 8px; box-shado…

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body { font-family: 'Arial', sans-serif; line-height: 1.6; color: #333; } h2 { color: #007bff; } p { margin: 20px 0; } 1. サッカーボールの進化 サッカーボールは長い歴史を通じて大きく進化してきました。最初のサッカーボールは動物の膀胱を膨らま…

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