JSFiddle - React, Tailwind, and code Playground

HTML

<div id="pai"> 
    <div id="div1"></div> 
</div>
<div id="div2"></div>

CSS

div{
  width: 150px;
  height: 50px;
  background-color: blue;
}

#div1:hover ~ #div2{
    background-color:red;
}