JSFiddle - React, Tailwind, and code Playground

HTML

<textarea id="text"></textarea>
<input type="checkbox" name="check" id="blinkchk" value="Blink" />Blink

CSS

.imgtofloat{
    position:relative;
    vertical-align:middle; 
}
.divwithcontent{
    position:absolute;
    display:table-cell; 
    vertical-align:middle; 
    text-align:center
}

JavaScript

$("#blinkchk").click(function(){
    setInterval(function(){$("#text").fadeOut(200,function(){
      $(this).fadeIn(200);
    })},400);

});