JSFiddle - React, Tailwind, and code Playground

HTML

<div id="seventyfive">
    <img src="http://cdn3.tnwcdn.com/files/2010/02/yahooms-300x120.jpg" />
</div>

CSS

#seventyfive {
    position:relative;
    font-size:100px;
    font-weight:bold;
}

JavaScript

(function pulse(back, i) {
    var el = $('#seventyfive img'),
        wd = back    ? 20 : -20,
        op = back    ? 1  : 0.5,
        de = i%4!==0 ? 0  : 1400;
    
    el.delay(de).animate({
        width   : el.width() + (wd), opacity : op
    }, 300, function() {
        pulse(!back, ++i);
    });
})(false, 0);