css when hover on element other component highlight too
<div id="container">
<div id="cube">
</div>
</div>
//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; }