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Customizing Colors of Field Status Indicators
ServiceNow field status indicators enable administrators to highlight certain fields to give status information to users (such as whether a field is mandatory, has been modified, is read-only, and so on). In UI11 and the classic user interface, it is possible to customize the color of these field status indicators by navigating to System Properties > CSS:
This is an example in which the standard red and green indicators have been customized in a Dublin instance: