JSFiddle - React, Tailwind, and code Playground

HTML

<div id="divcustumfld">Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa.</div>
<br>
<br>
<br>
<div onClick="divcustumfldshow()">click</div>

CSS

#divcustumfld {
    opacity:1;
    transition: .5s linear;
}
#divcustumfld.hide {
    opacity:0;
}

JavaScript

function divcustumfldshow() {
     var dive = document.getElementById("divcustumfld");
     dive.classList.toggle('hide')
 }