If any of you are wondering why your SharePoint online menu suddenly went black, I believe this is from an update rolled out by Microsoft. They have set both the background and foreground to black :) .o365cs-base.o365cst.o365spo button.o365cs-spo-topbarMenuOpen, .o365cs-base.o365cst.o365spo button.o365cs-spo-topbarHover, .o365cs-base.o365cst.o365spo a.o365cs-spo-topbarMenuOpen, .o365cs-base.o365cst.o365spo a.o365cs-spo-topbarHover { background-color: #000; border-color: #dedede; color: #000; } .o365spo.o365cs-nav-contextMenu .o365cs-base.o365cst.o365cs-contextMenu { background-color: #000; } https://prod.msocdn.com/3.06.5615.1/en-US/css/O365ShellCore.css Waiting for a fix! Until they roll out a fix, add this to your custom css. And dont forget to clean up later. .o365cs-base.o365cst.o365spo button.o365cs-spo-topbarMenuOpen, .o365cs-base.o365cst.o365spo button.o365cs-spo-topbarHover, .o365cs-base.o365cst.o365spo a.o365c
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