body { background: #cdd5c6; /* くすんだ山のような緑色 */ font-family: "Hiragino Kaku Gothic ProN", Meiryo, sans-serif; line-height: 1.9; color: #2f2f2f; padding: 2em; } .container { max-width: 720px; background: white; padding: 2.5em; margin: auto; box-shadow: 0 0 10px rgba(0,0,0,0.05); border-radius: 10px; } …