plugin-core/plugin/grails-app/views/login/denied.gsp (11 lines of code) (raw):
<html>
<head>
<meta name="layout" content="${gspLayout ?: 'main'}"/>
<title><g:message code='springSecurity.denied.title' /></title>
</head>
<body>
<div class="body">
<div class="errors"><g:message code='springSecurity.denied.message' /></div>
</div>
</body>
</html>