JSFiddle - React, Tailwind, and code Playground

HTML

<div> 
    <div class="box">1.1</div> 
    <div class="box selectedBox">1.2</div>
    <div class="box">1.3</div>
    <div class="box">1.4</div>
    <div class="box">1.5</div> 
</div>
<div>
    <div class="box">2.1</div> 
    <div class="box selectedBox">2.2</div>
    <div class="box">2.3</div>
    <div class="box">2.4</div>
</div>

CSS

.selectedBox { background-color:red; }

JavaScript

$(".box").click(function () {
        $(this).siblings().removeClass("selectedBox");
        $(this).addClass("selectedBox");
        });