Reduce spacing between primary and social menu.

spearhead/assets/sass/_header.scss

@@ -66,7 +66,7 @@ $site-branding-height: 68px;
 		margin-top: 0;
 
 		.primary-menu-container {
-			margin-bottom: calc( .5 * var(--global--spacing-vertical) );
+			margin-bottom: 6px;
 		}
 
 		@include media( laptop-only ){ // TODO - use $navigation-max-break-point variable

spearhead/style-rtl.css

@@ -259,7 +259,7 @@ Tags: one-column, flexible-header, accessibility-ready, custom-colors, custom-me
 }
 
 .site-header .primary-navigation .primary-menu-container {
-	margin-bottom: calc( .5 * var(--global--spacing-vertical));
+	margin-bottom: 6px;
 }
 
 @media only screen and (max-width: 829px) {

spearhead/style.css

@@ -259,7 +259,7 @@ Tags: one-column, flexible-header, accessibility-ready, custom-colors, custom-me
 }
 
 .site-header .primary-navigation .primary-menu-container {
-	margin-bottom: calc( .5 * var(--global--spacing-vertical));
+	margin-bottom: 6px;
 }
 
 @media only screen and (max-width: 829px) {