JSFiddle - React, Tailwind, and code Playground

HTML

<img id="MainImage" src="http://static.jquery.com/files/rocker/images/logo_jquery_215x53.gif" /?

CSS

/*
#MainImage{
    transition-duration:3s;
}
*/

JavaScript

setInterval(Repeat, 50);


function Repeat() {
    $("#MainImage").animate({
        opacity: 0.15
    }, 4000).animate({
        opacity: 1.0
    }, 4000);
}