JSFiddle - React, Tailwind, and code Playground

HTML

<div class="card"></div>
<div class="card"></div>
<div class="card"></div>
<div class="card"></div>

JavaScript

$(function() {
  var colors = ['#1abc9c', '#2ecc71', '#3498db', '#9b59b6', '#34495e'];
  $(".card").each(function() {
    $(this).css('border-top', '5px solid ' + colors[Math.floor(Math.random() * colors.length)]);
  });
});