I'm not sure what caused this as I've never encountered it before.I believe Ubuntu was probably doing some updates and maybe a package like xrandr got updated and the brightness got set very low or maybe the Nvidia driver. Iwas using my computer, left it and came back and thought the monitor was off it was so dark. It also could have been related to a bug or issue with the screensaver/sleep mode when the screen starts to dim before sleeping after X minutes and........

In Thunderbird in a very large folder suddenly all of my e-mail list became blank/white even though you could click on the invisible/white/blank lines and it would show the e-mails. Itried to close and reopen but only going to Folder -> Properties and clicking Repair Folder fixed it (basically it had to redownload/rebuild the entire index and all e-mails).........

add this style="background-size: contain;max-width: 100%; height: auto;" to your img code. Example: ........

So you've got a responsive site with tables but it breaks them so anything not viewable on the screen is now cut off. Here is a simple solution that will allow users to scroll horizontally so they can see the whole table: &........