body { font-family: "Yu Gothic", "Hiragino Kaku Gothic Pro", Meiryo, sans-serif; line-height: 1.6; max-width: 720px; margin: 2rem auto; padding: 0 1rem; color: #333; background−color: #fafafa; } h1, h2, h3 { color: #2c3e50; margin-top: 2rem; } h1 { font-size: 2rem; border-bottom: 3px solid #3498db; …