misc changes to header and login

    * Header optimizations for small screens
    * Style changes to login page.

Change-Id: Ia7a4fc0cab8e105348f8f8e36b3c61cdc938b2bb
Signed-off-by: Michael Davis <michael.s.davis@ibm.com>
diff --git a/src/scss/layout/_navigation.scss b/src/scss/layout/_navigation.scss
index 7a2d33c..bb08579 100644
--- a/src/scss/layout/_navigation.scss
+++ b/src/scss/layout/_navigation.scss
@@ -106,7 +106,7 @@
     @include fastTransition-all;
   }
   a {
-    padding: 1.2em .6em 1.2em 1em;
+    padding: 1.2em 1em 1.2em 1em;
     display: block;
     color: $black;
     text-decoration: none;