/* 全体のスタイル */ .responsive-container { text-align: center; margin: 20px auto; font-family: Arial, sans-serif; } .responsive-container h2 { color: #333; margin-bottom: 15px; font-size: 1.5em; } .responsive-container p { color: #555; margin-bottom: 20px; font-size: 1em; line-height: 1.5; } /* iframeのスタ…