JSFiddle - React, Tailwind, and code Playground

HTML

<div id="right">
    <form method="POST" action="<?php echo $_SERVER['REQUEST_URI']; ?>">
        ... some input fields here ...
        <input id = "btnRight" type="submit" value="Submit">            
    </form>
</div>

CSS

#right {
    width: 50%;
    min-width: 35px;
    float: right;
    margin: 0;
    position: relative;
    overflow: hidden;
}

JavaScript

$(document).ready( function(){
    $('#btnRight').click(function (e) {
        e.preventDefault();
        $('#right').animate({ width: '3%' }, 'slow'); 
        
    });
});