Alert background color, without border #695

Job	Run time
build_and_test (macos-latest) / build (18)	5m 55s
build_and_test (macos-latest) / build (20)	4m 47s
build_and_test (ubuntu-latest) / build (18)	2m 34s
build_and_test (ubuntu-latest) / build (20)	2m 25s
build_and_test (windows-2019) / build (18)	4m 46s
build_and_test (windows-2019) / build (20)	5m 7s
build_and_test (ubuntu-latest) / collect_coverage_reports	0s
build_and_test (windows-2019) / collect_coverage_reports	0s
build_and_test (macos-latest) / collect_coverage_reports	0s
test_hb_service (ubuntu-latest, 18.x)	2m 21s
test_hb_service (macos-latest, 18.x)	3m 43s
test_hb_service (windows-2019, 18.x)	3m 39s
test_hb_service (windows-latest, 18.x)	3m 42s
lint / ESLint	49s
	39m 48s

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