JSFiddle - React, Tailwind, and code Playground

HTML

<div id="the-content">
    <p></p>
    <p></p>
     <h2><a href="#">aaaaa</a></h2>

     <h3><a href="#">bbbbb</a></h3>

     <h3><a href="#">ccccc</a></h3>

     <h3><a href="#">ddddd</a></h3>

     <h3><a href="#">eeeee</a></h3>

    
<h2><a href="#">fffff</a></h2>

    <p></p>
</div>

CSS

.addcolor {
    color:#f00;
}

JavaScript

$("#the-content h2").nextAll().not("h2:last").children("a").addClass("addcolor");