JSFiddle - React, Tailwind, and code Playground
HTML
<div class="content_about">
Test
</div>
JavaScript
//$('.content_about').hide(,'fast',function(){
//alert('test')
//});
$( "div" ).hide( "drop", { direction: "down" }, "slow" );
<div class="content_about">
Test
</div>
//$('.content_about').hide(,'fast',function(){
//alert('test')
//});
$( "div" ).hide( "drop", { direction: "down" }, "slow" );