Answers for "on hover change the css of another class in css"

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;
}