Fix button hover style #5982

Job	Run time
build-and-check	3m 12s
test-integration-packages/internal	1m 14s
test-integration-packages/billing	1m 12s
test-integration-common	42s
test-integration-web	45s
test-integration-packages/agent-runtime	39s
test-integration-sdk	1m 26s
test-integration-cli	43s
test-packages/agent-runtime	52s
test-.agents	43s
test-packages/billing	40s
test-common	46s
test-packages/internal	48s
test-web	1m 21s
test-cli	52s
test-sdk	52s
	16m 47s

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