What to do if the hovered element is inside the container(that we want to be effected) 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: css affect other elements on hover

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