feat: support custom background color #9881

Job	Run time
install	21s
setup-matrix	6s
unit-tests	39s
flow	50s
lint	1m 14s
build	2m 2s
instance-version	7s
cypress-dev (1, cypress/e2e/AllAccessibleRecordsPage/AllAccessibleRecordsPage.feature, cypress/e2...	6m 32s
cypress-dev (2, cypress/e2e/EnrollmentAddEventPage/EnrollmentAddEventPageForm/EnrollmentAddEventP...	9m 17s
cypress-dev (3, cypress/e2e/EnrollmentAddEventPage/EnrollmentAddEventPageNavigation/EnrollmentAdd...	9m 56s
cypress-dev (4, cypress/e2e/EnrollmentAddEventPage/ProgramStageSelector/ProgramStageSelector.feat...	10m 3s
cypress-dev (5, cypress/e2e/EnrollmentEditEventPage/EnrollmentEditEventPageForm/EnrollmentEditEve...	15m 23s
release	36s
	57m 6s

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