JSFiddle - React, Tailwind, and code Playground

HTML

<input type='button' class='btn ' />
<input type='button' class='btn' />
<input type='button' class='btn' />

CSS

.active {
  background-color: red
}
.inactive{
  background-color:green;
}

JavaScript

$('.btn').click(function() {
    $(this).addClass('inactive');
  $('.btn').not(this).removeClass('active');
  
});