Fix the nav footer

Author: samselikoff

addon/components/docs-viewer/x-nav/styles.scss

@@ -6,7 +6,7 @@
   font-weight: 400;
   display: flex;
   flex-direction: column;
-  overflow: scroll;
+  overflow: hidden;
 
   &-header {
     text-align: center;
@@ -51,13 +51,13 @@
 
   &-list-wrapper {
     padding: 20px 0;
+    overflow: scroll;
   }
 
   &-footer {
-    border-top: 1px solid #eee;
-    // margin: 20px 0;
     padding: 20px;
     text-align: center;
+    box-shadow: 0 0px 6px 3px rgba(0, 0, 0, 0.1);
   }
 
   &-footer-link {