JSFiddle - React, Tailwind, and code Playground

HTML

<div class="block">
    <div class="block2">
        <a href="#"><img src="img.jpg" /></a>
    </div>
    <a id="test" href="#"><h3>Заголовок</h3></a>
</div>

CSS

a {
    color:#000;
}

JavaScript

$("img").mouseover(function(e) { 
    $("#test").css("color","#f00"); }).mouseout(function(e) { 
    $("#test").css("color","#000"); 
});