/usr/share/usermin/authentic-theme/unauthenticated/js/ckeditor/plugins/preview/styles
Edit: /usr/share/usermin/authentic-theme/unauthenticated/js/ckeditor/plugins/preview/styles/screen.css (242B)
div[style*="page-break-after"] {
background:url( ../images/pagebreak.gif ) no-repeat center center;
clear:both;
width:100%;
border-top:#999 1px dotted;
border-bottom:#999 1px dotted;
padding:0;
height:7px;
cursor:default;
}