Chrome Version: 69.0.3497.100 (Official Build) (64-bit)
OS: Linux

What steps will reproduce the problem?
(1) Go to photos.google.com/assistant. And click movie
(2) Open they grow up so fast (please make sure you have face clusters)
(3) Select/unselect people faces

What is the expected result?
When select the face, the background color should be light grey immediately

What happens instead?
When select the face, the background color is still white (although css has been applied). If we move mouse out of the face element, the background color applied.