Header and navigation fixes

	- fixed header slider position
	- decreased size of main nav buttons based on user feedback

Change-Id: I86f6d2c448352c820e843837368c74407c00ec90
Signed-off-by: Michael Davis <michael.s.davis@ibm.com>
diff --git a/app/common/styles/directives/app-navigation.scss b/app/common/styles/directives/app-navigation.scss
index c89b8e4..1a028d3 100644
--- a/app/common/styles/directives/app-navigation.scss
+++ b/app/common/styles/directives/app-navigation.scss
@@ -58,7 +58,7 @@
     color: $white;
     fill: $white;
     width: 100%;
-    padding: 1em;
+    padding: 0 .8em .8em;
     display: block;
     text-align: center;
     margin-bottom: 0;
@@ -66,7 +66,7 @@
     border-radius: 0;
     text-decoration: none;
     border-top: 1px solid transparent;
-    border-bottom: 1px solid $darkgrey;
+    border-bottom: 1px solid darken($darkgrey, 15%);
     a {
       margin-bottom: 5px;
     }
@@ -81,7 +81,6 @@
       background: $nav__second-level-color;
       fill: $black;
       color: $medblue;
-      padding: 1em;
       border-radius: 0;
       border-bottom: 1px solid $lightgrey;
       cursor: pointer;