JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://github.com/lrbabe/jquery/raw/025f2c63e487e069215b2a03ded2b98198904af9/src/css.js"></script>
<form id="foo">
First name: <input type="text" name="firstname" /><br />
Last name: <input type="text" name="lastname" />
</form>
<br /><br /><br />
<form id="bar">
First name: <input type="text" name="firstname" /><br />
Last name: <input type="text" name="lastname" />
</form>

CSS

#foo {
    background: white;
}

#bar {
    filter: progid:DXImageTransform.Microsoft.gradient(startColorStr='#ffff0000', EndColorStr='#ffffffff');
    zoom: 1;
}

JavaScript

$(function() {
    setTimeout(function() {
        $('#bar').css('opacity', .5);
    }, 500);
});