Added some transition

style.css

@@ -5,3 +5,11 @@
 .col-sm.vert {
   max-height: 60% !important;
 }
+
+body {
+  transition: background 0.4s ease-in-out, color 0.4s ease-in-out;
+}
+
+nav {
+  transition: background 0.4s ease-in-out, color 0.4s ease-in-out;
+}