JSFiddle - React, Tailwind, and code Playground
HTML
<div id="a">a</div>
<div id="b">b</div>
<div id="c">c</div>
<div id="d">d</div>
JavaScript
var a =document.getElementById("a");
var b =document.getElementById("b");
var c = document.getElementById("c");
var d = document.getElementById("d");
var identities = [a,b,c,d];
for (i= 0; i < identities.length; i++){
identities[i].style.border = '1.5px solid red';
}