JSFiddle - React, Tailwind, and code Playground

HTML

<div id="foo" class="test">should grow on both axis</div>
<div id="bar" class="test">should grow on both axis</div>

CSS

.test {
    background: red;
    width: 100px;
    height: 100px;
    margin: 0 0 10px;
}
#foo { background: #9F6; }
#bar { background: #FF6; }

JavaScript

setInterval(function(){
    $('#foo').css({
        width: '+=2',
        'padding-top': '+=2'
    });
    $('#bar').css({
        height: '+=2',
        paddingLeft: '+=2px',
    });
}, 150);