JSFiddle - React, Tailwind, and code Playground

HTML

<button id="btn1">Abre classe1</button>
 <div id="conteudo">
     <p class="classe1">Teste1</p>
     <p class="classe1">Teste2</p>
     <p class="classe2">Teste3</p>
 </div>

CSS

#conteudo p {
    display: none;
}

JavaScript

$('#btn1').on('click', function(){
    $('#conteudo p.classe1').show();
});