diff --git a/core/css/styles.css b/core/css/styles.css
index b41c205c21..452a90c227 100644
--- a/core/css/styles.css
+++ b/core/css/styles.css
@@ -334,3 +334,139 @@ div.crumb { float:left; display:block; background:url('../img/breadcrumb.svg') n
 div.crumb:first-child { padding:10px 20px 10px 5px; }
 div.crumb.last { font-weight:bold; background:none; padding-right:10px; }
 div.crumb a{ padding: 0.9em 0 0.7em 0; }
+
+
+/* ---- APP STYLING ---- */
+#app { height: 100%; width: 100%; }
+/* Navigation: folder like structure */
+#app-navigation {
+	width: 250px; height: 100%; float: left; padding-bottom: 32px;
+	-moz-box-sizing: border-box; box-sizing: border-box;
+	border-right: 1px solid #ccc; background-color: #f8f8f8;
+}
+#app-navigation > ul {
+	height: 100%; overflow: auto;
+	-moz-box-sizing: border-box; box-sizing: border-box;
+}
+#app-navigation li {
+	width: 100%; position: relative;
+	-moz-box-sizing: border-box; box-sizing: border-box;
+	text-shadow: 0 1px 0 rgba(255, 255, 255, .9);
+}
+#app-navigation li.active {	background-color: #ccc;	text-shadow: 0 1px 0 rgba(255,255,255,.7); }
+
+#app-navigation > ul > li {
+	border-bottom: 1px solid #ddd;
+	border-top: 1px solid #fff;
+	background-color: #eee;
+}
+#app-navigation > ul > li.active { border-bottom: 1px solid #ccc; border-top: 1px solid #ccc; }
+
+#app-navigation ul.with-icon a {
+	padding-left: 32px;
+	background-size: 16px 16px;	background-repeat: no-repeat; 
+	background-position: 10px center;
+}
+
+#app-navigation li > a {
+	display: block; width: 100%; padding: 0 16px; overflow: hidden; line-height: 32px;
+	-moz-box-sizing: border-box; box-sizing: border-box;
+	white-space: nowrap; text-overflow: ellipsis; color: #333;
+}
+#app-navigation li:hover > a { background-color: #ccc; }
+#app-navigation > ul > li:hover { border-top: 1px solid #ccc; }
+
+#app-navigation li.collapsible > button.collapse {
+	display: none; position: absolute; left: 6px; top: 5px; height: 16px; width: 16px;
+	background: none; background-image: url('%webroot%/core/img/actions/triangle-s.svg');
+	background-repeat: no-repeat; background-size: 16px 16px;
+	border: none; border-radius: 0; outline: none !important;
+	box-shadow: none;
+}
+
+#app-navigation li.collapsible:hover > a { background-image: none; }
+#app-navigation li.collapsible:hover > button.collapse { display: block; }
+
+#app-navigation li.collapsible button.collapse {
+	-moz-transform: rotate(-90deg);
+	-webkit-transform: rotate(-90deg);
+	-ms-transform:rotate(-90deg);
+	-o-transform:rotate(-90deg);
+	transform: rotate(-90deg);
+}
+
+#app-navigation li.collapsible.open button.collapse {
+	-moz-transform: rotate(0);
+	-webkit-transform: rotate(0);
+	-ms-transform:rotate(0);
+	-o-transform:rotate(0);
+	transform: rotate(0);
+}
+
+/* Second level nesting for lists */
+#app-navigation > ul ul { display: none; }
+#app-navigation > ul ul li > a { padding-left: 32px; }
+#app-navigation > ul.with-icon ul li > a { padding-left: 48px; background-position: 24px center; }
+
+#app-navigation .open {
+	background-image: linear-gradient(top, rgb(238,238,238) 0%, rgb(245,245,245) 100%);
+	background-image: -o-linear-gradient(top, rgb(238,238,238) 0%, rgb(245,245,245) 100%);
+	background-image: -moz-linear-gradient(top, rgb(238,238,238) 0%, rgb(245,245,245) 100%);
+	background-image: -webkit-linear-gradient(top, rgb(238,238,238) 0%, rgb(245,245,245) 100%);
+	background-image: -ms-linear-gradient(top, rgb(238,238,238) 0%, rgb(245,245,245) 100%);
+}
+
+#app-navigation > ul li.open:hover {
+	-webkit-box-shadow: inset 0 0 3px #cccccc;
+	box-shadow: inset 0 0 3px #cccccc;
+	border-top: 1px solid #ccc;
+}
+
+#app-navigation > ul li.open ul { display: block; }
+
+/* drag and drop */
+#app-navigation .drag-and-drop {
+	-moz-transition: padding-bottom 500ms ease 0s;
+	-o-transition: padding-bottom 500ms ease 0s;
+	-webkit-transition: padding-bottom 500ms ease 0s;
+	-ms-transition: padding-bottom 500ms ease 0s;
+	transition: padding-bottom 500ms ease 0s;
+	padding-bottom: 40px;
+}
+#app-navigation .personalblock > legend { padding: 10px 0; margin: 0; }
+#app-navigation .error { color: #DD1144; }
+
+
+
+/* Part where the content will be loaded into */
+#app-content { height: 100%; overflow-y: auto; }
+
+/* settings area */
+#app-settings {	position: fixed; width: 249px; bottom: 0; border-top: 1px solid #ccc; }
+#app-settings-header { background-color: #eee; }
+#app-settings-content {	background-color: #eee;	display: none; padding: 10px; }
+#app-settings.open #app-settings-content { display: block; }
+
+.settings-button {
+	height: 32px; width: 100%; padding: 0;	margin: 0; display: block;
+	background-image: url('%webroot%/core/img/actions/settings.png');
+	background-repeat: no-repeat; background-position: 10px center;
+	background-color: transparent;
+	box-shadow: none;
+	border-radius: 0; border: 0;
+}
+.settings-button:hover { background-color: #ddd; }
+
+/* icons */
+.folder-icon { background-image: url('%webroot%/core/img/places/folder.png'); }
+.delete-icon { background-image: url('%webroot%/core/img/actions/delete.svg'); }
+.delete-icon:hover { background-image: url('%webroot%/core/img/actions/delete-hover.svg'); }
+.edit-icon { background-image: url('%webroot%/core/img/actions/rename.svg'); }
+
+/* buttons */
+button.loading {
+	background-image: url('%webroot%/core/img/loading.gif');
+	background-position: right 10px center;
+	background-repeat: no-repeat;
+	padding-right: 30px;
+}
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