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Only this worked for me:
#container:hover .cube { background-color: yellow; }
Where .cube is CssClass somewhere inside of the #cube#container.
.cube
#cube#container
Tested in Firefox, Chrome and Edge.
Where .cube is CssClass of the #cube.
#cube
Where .cube is CssClass somewhere inside of the #container.
#container
Where .cube.cube is CssClass of the #cube#cube.
Tested in FirefoxFirefox, ChromeChrome and EdgeEdge.