body { font-family: "Hiragino Kaku Gothic ProN", Meiryo, sans-serif; line-height: 1.8; max-width: 720px; margin: 2em auto; padding: 0 1em; background: #fff; color: #222; } h1 { border-left: 6px solid #2e8b57; padding-left: 0.5em; color: #2e8b57; } h2 { border-left: 4px solid #2e8b57; padding-left: 0…