JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://app.ecwid.com/script.js?11459291&data_platform=muse_plugin_j26" charset="utf-8"></script>
        <script>
            xProductBrowser("defaultCategoryId=23405871");
 </script>

<script> 
$(".ecwid-productBrowser-productsGrid-mainTable ecwid-productBrowser-productsGrid-v2 td").on("click",function(){
	alert("dvd");
	$(".demo").show();
});
  
// Imprime preços frontais
// Aqui é para limpar os excessos do setInterval
    var counter1 = 0
    var timer1 = setInterval(function(){
    if(counter1 >= 0){
      $("h6").remove()
    }
    counter1++
// Aqui pega as classes para serem tratadas     
	var demo1 = $('span.ecwid-productBrowser-price-value');
		demo1.each(function() {
		var valor1 = parseInt(this.innerHTML.replace(/\./g, '').replace(',','.').substr(2) / 3, 10).toFixed(2).replace('.',',')
			$(this).after("<h6 style='color: #e9d0ba;font-size:15px;'>3x de " +valor1+ " sem juros </h6>")
		})
  
    }, 1000)
//-----------------------------------------------------------------------------------------------   
// Imprime os preços internos
// Aqui é para limpar os excessos do setInterval
    var counter = 0
    var timer = setInterval(function(){
		if($(".ecwid-productBrowser-details").is(":visible")){
			mostra = "";
		}else{
			mostra = "display: none;";
		}
    if(counter >= 0){
      $("h5").remove()
    }
    counter++
// Aqui pega as classes para serem tratadas 
        var demo = $('div.ecwid-productBrowser-price');
            demo.each(function() {
            var valor = parseInt(this.innerHTML.replace(/\./g, '').replace(',','.').substr(2) / 3, 10).toFixed(2).replace('.',',')
                $(this).after("<h5 class='demo' style='"+mostra+"color: #e9d0ba;font-size:15px;'>3x de " +valor+ " sem juros </h5>")
        })        
		}, 1000) 

</script>