JSFiddle - React, Tailwind, and code Playground

CSS

.inter{
  background:red;
}
div{
  background:gray;
  display:inline-block;
  padding:10px;
  margin:2px;
}

JavaScript

var a = [1,2,4,5,6];
var b = [1,4,5,7,8,9,10];

var intersect = a.filter(value => -1 !== b.indexOf(value));

function handler(el){
	const d = document.createElement("div");

  if (intersect.includes(el)) {
	  d.classList.add("inter");
  }
  
  d.innerHTML = el;
	document.body.appendChild(d);
}

a.forEach(handler);

document.body.appendChild(document.createElement("br"));

b.forEach(handler);