css if one hover every other code example

Example 1: when hover target diffrent element

//cube is directly inside the container:
#container:hover > #cube { background-color: yellow; }

//cube is next to (after containers closing tag) the container:
#container:hover + #cube { background-color: yellow; }

//If the cube is somewhere inside the container:
#container:hover #cube { background-color: yellow; }

//If the cube is a sibling of the container:
#container:hover ~ #cube { background-color: yellow; }

Example 2: make action on hover on other element

#container:hover #cube {
    background-color: yellow;   
}

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Misc Example