JSFiddle - React, Tailwind, and code Playground

HTML

<input id="b" type="button" value="Apply" /><br />
<div class="blue">1</div>
<div class="blue">2</div>
<div class="blue">3</div>

JavaScript

$.fn.blueBorder = function(){
    this.each(function(){
        $(this).css("border","solid blue 2px");
    });
    return this;
};
$.fn.blueText = function(){
    this.each(function(){
        $(this).css("color","blue");
    });
    return this;
};
$("#b").click(function(){
    $('.blue').blueBorder().blueText();
});