added .story-page page-break, improved ui document selection

assets/css/layout.scss

@@ -96,3 +96,13 @@ p {
     /*-webkit-region-break-inside: avoid;*/
     /*               break-inside: avoid;*/
 }
+
+.story-page, .page-break {
+    /* Apply this class to an element to put it on a new region.
+     * Hint:
+     * You can also use an empty <div class="page-break"></div>
+     * if you want to put manual page breaks without attaching it to an HTML element
+     */
+  //  -webkit-region-break-before: always;
+           break-after: region;
+}

assets/css/setup.scss

@@ -1,6 +1,6 @@
 /* the geometry of the page */
 $page-width: 210mm;
-$page-height: 290mm;
+$page-height: 297mm;
 
 /* the size of the crop marks*/
 $crop-size: 7mm;