--- a/default/static/styles.css	Wed Nov 15 08:52:14 2017 +0100
+++ b/default/static/styles.css	Fri Dec 01 00:46:42 2017 +0100
@@ -3,11 +3,23 @@
 }
 
 body {
+    margin: 0;
+    padding: 0;
     display: flex;
     height: 100vh;
     flex-direction: column;
     box-sizing: border-box;
-    margin: 0;
+}
+
+#main_side_bar {
+    
+}
+
+#main_area {
+    flex: 1;
+    display: flex;
+    flex-direction: column;
+    box-sizing: border-box;
 }
 
 #body {
@@ -23,19 +35,7 @@
 .box {
     background-color: #edf2ff;
     border-radius: 0;
-}
-
-@media (min-width: 500px) {
-    html {
-        background-size: auto;
-    }
-    body {
-        padding: 8px;
-    }
-    .box {
-        border-radius: 1em;
-        box-shadow: 10px 10px 16px -5px rgba(0,0,0,0.5);
-    }
+    border-color: silver;
 }
 
 .title {
@@ -53,48 +53,164 @@
     margin: 1.5em auto;
 }
 
-/* generic */
+/*** Generic ***/
 
 .button:hover {
     background-color: #bc0000;
 }
 
-/* Menus */
+/*** Messages ***/
+
+.message_info {
+    max-width: 500px;
+    margin: 0 auto;
+    padding: 1em;
+    text-align: justify;
+}
+
+.message_info pre {
+    background: #ddd;
+    padding: 1em;
+}
+
+/*** Menus ***/
 
 .menu ul {
     display: flex;
-    justify-content: center;
+    padding: 0;
     margin-top: 8px;
-    padding: 0;
     list-style: none;
 }
 
-.menu li {
+.menu a {
+    display: block;
+    color: inherit;
+    text-decoration: none;
+    font-variant: small-caps;
+}
+
+.main_menu {
+    min-width: 200px;
+    /* background-color: #eaeaea; */
+    background-color: #333;
+    color: white;
+}
+
+.main_menu ul {
+    flex-direction: row;
+    flex-wrap: wrap;
+}
+
+.main_menu li {
+    flex: 1;
+    padding: 0;
+    margin: 0 1em;
+}
+
+.main_menu a {
+    display: inline;
+    white-space: nowrap;
+}
+
+.main_menu a:hover {
+    background-color: initial;
+    text-shadow: 1px 1px 2px;
+    font-weight: bold;
+}
+
+.category_menu ul {
+    justify-content: center;
+}
+
+.category_menu li {
     margin: 0.5em;
     text-align: center;
 }
 
-.menu a {
-    color: inherit;
-    text-decoration: none;
-	border: solid 1px;
-	padding: 0.5em;
-	font-variant: small-caps;
-	border-radius: 1em;
-	background: #eee;
+.category_menu a {
+    border: solid 1px;
+    padding: 0.5em;
+    border-radius: 0.2em;
+    background: #eee;
+}
+
+/*** containers ***/
+
+/* tabs */
+
+.tab_container {
+    max-width: 1000px;
+    margin: 0 auto;
+}
+
+.tab_header {
+    background-color: white;
+    border-bottom: 1px solid lightgrey;
+}
+
+.tab_header ul {
+    display: flex;
+    margin: 0;
+    padding: 0;
+    list-style: none;
+    background-color: white;
+}
+
+.tab_page {
+    box-sizing: border-box;
+    padding-top: 2em;
+    border: 1px solid lightgrey;
+    border-top: none;
+    display: None;
 }
 
-.menu a:hover {
+.tab_page.clicked {
+    display: block;
+}
+
+.tab_button {
+    display: inline;
+    color: grey;
+    background-color: white;
+    border-top: 1px solid lightgrey;
+    border-left: 1px solid lightgrey;
+    border-bottom: 1px solid lightgrey;
+    padding: 0 1em;
+    cursor: pointer;
+    /* we go down by 1px to remove bottom border from .tab_header */
+    margin-bottom: -1px;
 }
 
-/* Forms */
+.tab_button.clicked {
+    /* background: lightgrey; */
+    color: inherit;
+    border-bottom: none;
+}
+
+li.tab_button:last-child {
+    border-right: 1px solid lightgrey;
+}
+
+.tab_button input {
+    display: None;
+}
+
+.tab_button label {
+    margin: 1em;
+}
+
+.tab_button input:checked + label {
+    font-weight: bold;
+}
+
+/*** Forms ***/
 
 .form_submit {
     margin: 1em auto 0;
     display: block;
 }
 
-/* XMLUI */
+/*** XMLUI ***/
 
 .xmlui_cont_vertical>* {
     display: block;
@@ -118,3 +234,32 @@
   color: inherit;
   text-decoration: inherit;
 }
+
+@media (min-width: 500px) {
+    html {
+        background-size: auto;
+    }
+
+    body {
+        flex-direction: row;
+    }
+
+    #main_area {
+        overflow: auto;
+    }
+
+    .box {
+        border-radius: 1em;
+        box-shadow: 10px 10px 16px -5px rgba(0,0,0,0.5);
+    }
+
+    .main_menu a {
+        display: block;
+        padding: 2em 0;
+    }
+
+    .main_menu ul {
+        flex-direction: column;
+        padding-left: 2em;
+    }
+}