body { background: #e4e8e4; /* ごく淡い緑みのグレー */ font-family: "Hiragino Kaku Gothic ProN", Meiryo, sans-serif; line-height: 1.9; color: #333; padding: 2em; } .container { max-width: 720px; background: #ffffff; padding: 2.5em; margin: auto; box-shadow: 0 0 10px rgba(0,0,0,0.06); border-radius: 12px; bord…