I don’t know that I consider this a bug as it doesn’t break functionality. I suppose, by technical senses, it IS a bug.
Either way, fixed in working branch now.
If you must see this, please run:
wget -O /var/www/fog/management/default/fog.css https://raw.githubusercontent.com/FOGProject/fogproject/406c89e5522ae0e2f7398432dd4f3186fb13c982/packages/web/management/css/default/fog.css