JSFiddle - React, Tailwind, and code Playground

HTML

<div id="conteudo"></div>

CSS

#conteudo { text-align: center; }
#conteudo p { background: Khaki; }

JavaScript

$lblAviso = $('<p id="lblAviso">Salvo com sucesso</p>');
$lblAviso.hide();
$('#conteudo').append($lblAviso);
$lblAviso.fadeIn();
$lblAviso.fadeOut(3000);