Removed hardcoded styling from layout, improved aux nav

(cherry picked from commit fd3c68cd1a39e059180c35c1d56ffa33ef4dfde4)

_sass/layout.scss

@@ -148,7 +148,7 @@
   @include fs-6;
 }
 
-.menu-button {
+.site-button {
   appearance: none;
   display: flex;
   height: 100%;
@@ -158,6 +158,7 @@
   text-transform: uppercase;
   background: transparent;
   border: 0;
+  @include fs-3;
 
   @include mq(md) {
     display: none;
@@ -185,6 +186,8 @@ body {
   left: 0;
   padding-top: $sp-4;
   padding-bottom: $sp-4;
+  color: $grey-dk-000;
+  @include fs-2;
 
   @include mq(md) {
     position: static;

_sass/navigation.scss

@@ -81,9 +81,27 @@
 
 .aux-nav {
   align-self: center;
+
+  .aux-nav-list {
+    padding: 0;
+    margin: 0;
+    list-style: none;
+    @include fs-2;
+  }
+
+  .aux-nav-list-item {
+    display: inline-block;
+    margin-right: $sp-2;
+    @include fs-2;
+
+    &:last-child {
+      margin-right: 0;
+    }
+  }
 }
 
 // Breadcrumb nav
+
 .breadcrumb-nav {
   @include mq(md) {
     margin-top: -$sp-4;