Edit requests of background-imageを横幅100%で綺麗に可変表示させる(レスポンシブ、スマホサイト制作時とかに)

Please check the preview of this article

We released Markdown parser changes on February 24, 2022. There may be some unexpected appearance changes in this update, because this article was posted before the changes.
Please don't forget to check the preview before updating your article.
For more information on the changes, please read this article.