Ever since OS X Yosemite (10.10) came out Mac users have had the option to enable a dark mode. Dark mode doesn’t do too much, but it does change the menu bar at the top of screen from a bright gray to a much darker gray. More simply, it inverts the colors so that the dark items are now the same color as the brighter areas and vise versa. For me, it is much more visually appealing and easier on the eyes. One thing that has bugged me for a long time is that there are some blank spaces on the icons that do not have a dark mode icon.
The problem is that the icons aren’t missing, they are just the same color as the dark mode background. The biggest offender of this is Google Hangouts. Luckily, Google allows you to remove the icon entirely from the Menu Bar so that you can get rid of the ugly “missing” icons.