ivy-custom-errorpage/error-404.xhtml

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:h="http://java.sun.com/jsf/html"
      xmlns:f="http://java.sun.com/jsf/core"
      xmlns:ui="http://java.sun.com/jsf/facelets"
      xmlns:p="http://primefaces.org/ui">

    <h:head>
        <f:attribute name="primefaces.THEME" value="serenity-ivy" />
        <f:facet name="first">
            <meta http-equiv="X-UA-Compatible" content="IE=edge" />
            <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
            <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0"/>
            <meta name="apple-mobile-web-app-capable" content="yes" />
        </f:facet>
        <title>PrimeFaces Serenity - Not Found</title>
    </h:head>

    <h:body styleClass="exception-body notfound">
        <div class="exception-panel">
            <div class="exception-code">
                404
            </div>
            
            <div class="exception-detail">
                
                <div class="exception-icon">
                    <i class="material-icons">&#xE5CD;</i>
                </div>
                <h1>PAGE NOT FOUND</h1>
                <p>Please contact the system administrator</p>
                <p:button icon="ui-icon-arrow-forward" href="/ivy/sys/info.xhtml" value="Back to info" />
            </div>
        </div>

        <style>
            .exception-body.notfound .exception-panel .exception-code,
            .exception-body.notfound .exception-panel .exception-icon {
                background-color: #007095;
            }
            .exception-code {
                color:lightgray;
                font-weight: lighter;
                font-size: 18em;
            }
        </style>
        
        <h:outputStylesheet name="css/layout-ivy.css" library="serenity-layout" />
    </h:body>

</html>