diff -r a8300ef1876e -r 284e866f55c7 client/src/App.scss
--- a/client/src/App.scss	Wed Jun 07 18:18:44 2017 +0200
+++ b/client/src/App.scss	Thu Jun 08 11:13:41 2017 +0200
@@ -35,6 +35,38 @@
   }
 }
 
+.hovering-menu {
+    position: absolute;
+    z-index: 1;
+    top: -10000px;
+    left: -10000px;
+    margin-top: -64px;
+    opacity: 0;
+    transition: opacity .75s;
+}
+
+.categories-tooltip {
+    background-color: #efefef;
+    border-radius: 4px;
+    border: 1px solid #ccc;
+    padding: 5px;
+    .buttons {
+        display: flex;
+        flex-wrap: wrap;
+        justify-content: space-between;
+        button {
+            background-color: yellow;
+            border: 1px solid #ccc;
+        }
+        button:not(:last-child) {
+            margin-right: 10px;
+        }
+    }
+    .form-group:last-child {
+        margin-bottom: 0;
+    }
+}
+
 .editor-wrapper {
   border: 1px solid #efefef;
   padding: 20px;