Merge pull request #540 from jgeewax/534-fixed-navbar

Fix #534 - Nav bar is fixed and scrollable.

Author: ryanseys

docs/site/css/main.css

@@ -1385,13 +1385,14 @@ ul {
     }
 
     .side-nav {
-        position: absolute;
+        position: fixed;
         top: 0;
         left: 0;
         bottom: 0;
         width: 240px;
         padding-top: 7.7em;
         font-size: 0.9em;
+        overflow-y: auto;
     }
 
     .side-nav a {