JSFiddle - React, Tailwind, and code Playground

HTML

<div class="class1">
  <input type="radio" value="random1" />
  <label class="radio-lbl ui-state-active" for="random1">Label</label>
  <input type="radio" value="random2" />
  <label class="radio-lbl" for="random2">Label</label>
  <input type="radio" value="random3" />
  <label class="radio-lbl" for="random2">Label</label>
</div>
<div class="class1">
  <label for=""></label>
  <label for=""></label>
  <label for=""></label>
  <label for=""></label>
</div>
<div class="class1">
  <label for=""></label>
  <label for=""></label>
  <label for=""></label>
  <label for=""></label>
  <label for=""></label>
</div>

CSS

div {
  outline: solid 1px red;
  padding: 3px;
}
label {
  display: block;
  width: 5em;
  height: 1em;
  outline: solid 1px gray;
  margin: 5px;
}

JavaScript

jQuery('.class1').find('label:eq(1)').css('background', 'orange')