fix(layouts): update example css & classnames (#12145) #2924

Job	Run time
CI / Build	2m 21s
CI / Lint	1m 0s
Documentation / Build, test & deploy	9m 0s
CI / Build demo app	2m 39s
CI / Unit tests	3m 49s
CI / Integration tests (1)	4m 1s
CI / Integration tests (0)	3m 41s
CI / Integration tests (2)	3m 46s
CI / Integration tests (4)	4m 7s
CI / Integration tests (3)	3m 52s
Deploy release	3m 3s
	41m 19s

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