I am following an example to divide the screen into 3 columns, to my project I added the library of PrimeFaces 6.1, however it does not work for me. Here I leave the code.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:p="http://primefaces.org/ui">
<h:head>
<title>Guardar</title>
</h:head>
<h:body>
<h:form>
<div class="ui-g">
<div style="background-color: green" class="ui-md-4">4</div>
<div style="background-color: red" class="ui-md-4">4</div>
<div style="background-color: black" class="md-g-4">4</div>
</div>
<div class="ui-g">
<div style="background-color: yellow" class="ui-g-4">4</div>
<div style="background-color: blue" class="ui-g-8">8</div>
</div>
</h:form>
</h:body>
</html>