to simulate the issue on desktop – select date then time. The selected box will then dissappear, which is not a wanted result. It should stay as an orange box with white text as was on hover. The mobile screen does not have the same issue – odd.
I add css on Simple css, whatever was added manually was per directions from generate press, because woocommerce are useless with customisation advice.They blame every styling issue on the theme.
the css you posted at the top are not something I added, so no idea where it gets it from. When you say best ask “that plugin developer”, you mean woocommerce, right?
I pasted in you suggested css and nothing changed.