body { font-family: "Hiragino Kaku Gothic Pro", "ヒラギノ角ゴ Pro W3", Meiryo, sans-serif; line-height: 1.8; color: #333; } .container { max-width: 800px; margin: 0 auto; padding: 20px; } h1 { color: #2c3e50; border-bottom: 3px solid #3498db; padding-bottom: 10px; margin-bottom: 30px; font-size: 28px; tex…