diff --git a/backport-changelog/6.8/7642.md b/backport-changelog/6.8/7642.md
new file mode 100644
index 0000000000000..f00d4a5473aac
--- /dev/null
+++ b/backport-changelog/6.8/7642.md
@@ -0,0 +1,3 @@
+https://github.com/WordPress/wordpress-develop/pull/7642
+
+* https://github.com/WordPress/gutenberg/pull/66431
\ No newline at end of file
diff --git a/lib/compat/wordpress-6.8/remove-default-css.php b/lib/compat/wordpress-6.8/remove-default-css.php
new file mode 100644
index 0000000000000..1076d84f29921
--- /dev/null
+++ b/lib/compat/wordpress-6.8/remove-default-css.php
@@ -0,0 +1,11 @@
+<?php
+
+function gutenberg_remove_default_css( $hook ) {
+	// Maybe also remove on post.php when Gutenberg is enabled for posts.
+	if ( 'site-editor.php' !== $hook ) {
+		return;
+	}
+	wp_dequeue_style( 'colors' );
+}
+
+add_action( 'admin_enqueue_scripts', 'gutenberg_remove_default_css' );
diff --git a/lib/load.php b/lib/load.php
index 2c8a0fd0347c9..b91118cbced98 100644
--- a/lib/load.php
+++ b/lib/load.php
@@ -47,6 +47,7 @@ function gutenberg_is_experiment_enabled( $name ) {
 	require __DIR__ . '/compat/wordpress-6.7/rest-api.php';
 
 	// WordPress 6.8 compat.
+	require __DIR__ . '/compat/wordpress-6.8/remove-default-css.php';
 	require __DIR__ . '/compat/wordpress-6.8/block-comments.php';
 	require __DIR__ . '/compat/wordpress-6.8/class-gutenberg-rest-comment-controller-6-8.php';