JSFiddle - React, Tailwind, and code Playground

HTML

<div style="background:blue">

</div>
<div style="background:white">

</div>
<div style="background:red">

</div>

CSS

div {
  display: inline-block;
  width: 100px;
  height: 100px;
  border: 1px solid #000;
}

JavaScript

var divs = document.querySelectorAll('div');

[].slice.call(divs).forEach(function(div) {
  var color = window.getComputedStyle(div, null).backgroundColor;

  if (color === 'rgb(255, 255, 255)') {
    div.style.backgroundColor = 'transparent';
  }
});