I don’t what you are looking at or why it doesn’t show up on your end, but here is what the style.css looks like on my backend of the Pure and Simple child theme. It’s been there for several days and does nothing. I also tried putting this in the Jetpack CSS stylesheet editor but it didn’t do anything there either so I deleted it from there.
Theme Name: Pure and Simple Child
Description: A Child Theme for the Pure and Simple WordPress Theme. If you plan to do a lot of file modifications we recommend to use this Theme instead of the original Theme. Updating wil be much easier and you won’t lose your changes.
Author: Styled Themes
Author URI: https://www.styledthemes.com