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A child element hover cannot effect a parent class or a class elsewhere in the code besides children and siblings. You'll have to use Javascript for that.
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// If the cube is directly inside the container:
#container:hover > #cube { background-color: yellow; }
// If 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; }
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/* For wrapper is a child of item */
.item:hover .wrapper {
color: #fff;
background-color: #000;
}
/* For wrapper is another div and item is another */
.item:hover ~ .wrapper {
color: #fff;
background-color: #000;
}
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.item:hover ~ .wrapper {
color: #fff;
background-color: #000;
}•