Index: src/wp-content/themes/twentytwenty/assets/css/editor-style-block-rtl.css
===================================================================
--- src/wp-content/themes/twentytwenty/assets/css/editor-style-block-rtl.css	(revision 47599)
+++ src/wp-content/themes/twentytwenty/assets/css/editor-style-block-rtl.css	(working copy)
@@ -30,12 +30,6 @@
 	font-size: inherit;
 }
 
-.block-editor-block-list__empty-block-inserter .block-editor-inserter__toggle:not(:hover):not(:focus),
-.block-editor-default-block-appender .block-editor-inserter .block-editor-inserter__toggle:not(:hover):not(:focus) {
-	color: inherit;
-}
-
-
 /* Fonts ------------------------------------- */
 
 /*
Index: src/wp-content/themes/twentytwenty/assets/css/editor-style-block.css
===================================================================
--- src/wp-content/themes/twentytwenty/assets/css/editor-style-block.css	(revision 47599)
+++ src/wp-content/themes/twentytwenty/assets/css/editor-style-block.css	(working copy)
@@ -30,12 +30,6 @@
 	font-size: inherit;
 }
 
-.block-editor-block-list__empty-block-inserter .block-editor-inserter__toggle:not(:hover):not(:focus),
-.block-editor-default-block-appender .block-editor-inserter .block-editor-inserter__toggle:not(:hover):not(:focus) {
-	color: inherit;
-}
-
-
 /* Fonts ------------------------------------- */
 
 /*
Index: src/wp-content/themes/twentytwenty/functions.php
===================================================================
--- src/wp-content/themes/twentytwenty/functions.php	(revision 47599)
+++ src/wp-content/themes/twentytwenty/functions.php	(working copy)
@@ -555,6 +555,8 @@
 		)
 	);
 
+	add_theme_support( 'editor-styles' );
+
 	// If we have a dark background color then add support for dark editor style.
 	// We can determine if the background color is dark by checking if the text-color is white.
 	if ( '#ffffff' === strtolower( twentytwenty_get_color_for_area( 'content', 'text' ) ) ) {