Answers for "change css of another class on hover"

how to change another element on hover

// 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; }

css hover change another element

#a:hover ~ #b {
    background: #ccc
}

<div id="a">Div A</div>
<div>random other elements</div>
<div>random other elements</div>
<div>random other elements</div>
<div id="b">Div B</div>

on class hover another class color change

/* 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;
}