JSFiddle - React, Tailwind, and code Playground

HTML

<div class="hren nahren"></div>
<div class="hren nahren"></div>
<div class="hren nahren"></div>
<div class="hren nahren"></div>
<div class="hren nahren"></div>
<div class="hren nahren"></div>
<div class="hren nahren"></div>
<div class="hren nahren"></div>
<div class="hren nahren"></div>
<div class="hren nahren"></div>

CSS

div {
  height: 30px;
  width: 100px;
  margin-bottom: 5px;
}

.hren {
  outline: 1px red solid
}

.hren.nahren {
  outline: 1px blue solid
}

JavaScript

var a = document.getElementsByClassName('nahren');
Array.prototype.forEach.call(a, function(e) {
	e.classList.remove('nahren')
})