Index: wp-content/themes/twentynineteen/sass/navigation/_menu-main-navigation.scss
===================================================================
--- wp-content/themes/twentynineteen/sass/navigation/_menu-main-navigation.scss	(revision 44290)
+++ wp-content/themes/twentynineteen/sass/navigation/_menu-main-navigation.scss	(working copy)
@@ -169,6 +169,7 @@
 				color: $color__background-body;
 				display: block;
 				line-height: $font__line-height-heading;
+				text-shadow: none;
 				padding: calc( .5 * #{$size__spacing-unit} ) calc( 24px + #{$size__spacing-unit} ) calc( .5 * #{$size__spacing-unit} ) $size__spacing-unit;
 				white-space: nowrap;
 
Index: wp-content/themes/twentynineteen/sass/site/header/_site-featured-image.scss
===================================================================
--- wp-content/themes/twentynineteen/sass/site/header/_site-featured-image.scss	(revision 44290)
+++ wp-content/themes/twentynineteen/sass/site/header/_site-featured-image.scss	(working copy)
@@ -45,6 +45,10 @@
 		}
 	}
 
+	.main-navigation .sub-menu a {
+		opacity: inherit;
+	}
+
 	/* add focus state to social media icons */
 	.social-navigation a {
 		&:focus {
Index: wp-content/themes/twentynineteen/style-rtl.css
===================================================================
--- wp-content/themes/twentynineteen/style-rtl.css	(revision 44290)
+++ wp-content/themes/twentynineteen/style-rtl.css	(working copy)
@@ -1190,6 +1190,7 @@
   color: #fff;
   display: block;
   line-height: 1.2;
+  text-shadow: none;
   padding: calc( .5 * 1rem) 1rem calc( .5 * 1rem) calc( 24px + 1rem);
   white-space: nowrap;
 }
@@ -2156,6 +2157,10 @@
   color: #fff;
 }
 
+.site-header.featured-image .main-navigation .sub-menu a {
+  opacity: inherit;
+}
+
 .site-header.featured-image .social-navigation a:focus {
   color: #fff;
   opacity: 1;
Index: wp-content/themes/twentynineteen/style.css
===================================================================
--- wp-content/themes/twentynineteen/style.css	(revision 44290)
+++ wp-content/themes/twentynineteen/style.css	(working copy)
@@ -1190,6 +1190,7 @@
   color: #fff;
   display: block;
   line-height: 1.2;
+  text-shadow: none;
   padding: calc( .5 * 1rem) calc( 24px + 1rem) calc( .5 * 1rem) 1rem;
   white-space: nowrap;
 }
@@ -2162,6 +2163,10 @@
   color: #fff;
 }
 
+.site-header.featured-image .main-navigation .sub-menu a {
+  opacity: inherit;
+}
+
 .site-header.featured-image .social-navigation a:focus {
   color: #fff;
   opacity: 1;