JSFiddle - React, Tailwind, and code Playground

HTML

<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>

CSS

#B{
    background:orange;
}
#A:hover ~ #B {
    transition: background 2s ease;
    background: #fff
}