JSFiddle - React, Tailwind, and code Playground

HTML

<div>
  <span> <input type="radio" name="group1" value="Milk">  Milk </span> </br>
  <span> <input type="radio" name="group1" value="Butter"> Butter </span> </br>
  <span> <input type="radio" name="group1" value="Cheese"> Cheese </span> </br>
  <hr>
</div>

CSS

.line{
    background: yellow
}

JavaScript

$("input[type='radio']").change(function() {
    console.log(this.checked)
    if (this.checked) {
        // remove previously added line class
        $('span.line').removeClass('line');
        // you should add class to span, because text is 
        // within span tag, not in input
        $(this).parent().addClass('line');

    }
});