JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html>
    <body>
        <h1>Hello</h1>
        <img class="wink" />
        <br/>
        I am not insane <img class="wink" />
    </body>
</html>

CSS

img.wink  {
  content:url(data:image/png;base64, iVBORw0KGgoAAAANSUhEUgAAAAUA
AAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO
    9TXL0Y4OHwAAAABJRU5ErkJggg==);
    content: url(data:image/.gif;base64,R0lGODlhDwAPALMMAP/qAEVFRQAAAP/OAP/JAP6dAP+0AP/+k//9E///x//lAP//6wAAAAAAAAAAAAAAACH5BAEAAAwALAAAAAAPAA8AAARXkEkZap2Y1ZXOGRcWcAgCnEMRTEEnnDCQrtrxxjCoJSZw+y+CKnDo/WAEQ+WAwyUrvWZQGRg0TwKFcFX1xYI6zWCgEJizhBlrTGi31aKAYW4YZlgW2iQCADs=);
    height:15px;
    width:15px;
}