I have made an animated preloader that was being called from header.php of our logo and it was working flawlessly until recently.
Perhaps the theme was updated but I'm still seeing my code in header.php of the child theme.
The animation should paint the 4 logo instead of the spinning animation currently.
I notice that that dark background is being pulled from https://+++++.com/wp-content/uploads/hummingbird-assets/4eb3fdc5193f10ac78ea36673eb6f951.css
But it should be white. Though de-activating Hummingbird plugin also didn't fix it, so Hummingbird isn't the cause either.