body { font-family: "Hiragino Kaku Gothic ProN", sans-serif; line-height: 1.8; padding: 2em; background-color: #fdfdfd; color: #333; } h1 { font-size: 1.8em; border-left: 5px solid #888; padding-left: 0.5em; margin-bottom: 1em; } p { margin: 1em 0; } strong { background-color: #ffffcc; } 2025年6月。ニュー…