Menu Plus - Offside menu transition CSS bug

Hello hello,

There is an issue with slideout-overlay transition CSS. We have:
transition:visibility 0s ease,opacity .2s ease which cause overlay to hide instantly when clicking "close" button. visibility should also have .2s timing. This results in menu items animating, but without background animation. Looks weird.

Changing this to transition:visibility .2s ease,opacity .2s ease fixes animation. I have this in my CSS style, but since it's related to core styles, it affects other sites as well.

There is also one small invalid property value, doesn't hurt or do anything as I don't see any delay there, but since I'm here and it's there just letting you know. In offside.css transition-delay: delay 0s https://monosnap.com/file/cqPFAuxAwQXVcwwCaIwi0bqFqBC7x6#

If this is not the place for that, sorry in advance. Haven't found any bug report system/section.

Cheers