JSFiddle - React, Tailwind, and code Playground

HTML

<div>
    <input type="text">
</div>

CSS

div {
    padding:40px;
}

input:focus {background-color:red;}
.divfocus {background-color:blue;}

JavaScript

$(document)
.on("focus", "input", function(){
    $('div').addClass("divfocus");
})