body { background-color: #f2f2f2; color: #333; font-family: "Hiragino Kaku Gothic ProN", "游ゴシック体", YuGothic, sans-serif; line-height: 1.9; padding: 2em; max-width: 800px; margin: auto; } h1, h2 { text-align: center; color: #2f4f4f; } h1 { font-size: 1.9em; margin-bottom: 1em; } h2 { font-size: 1.3em…