diff --git a/theme/table.css b/theme/table.css
index 1a3b0ade..0a5c9e5b 100644
--- a/theme/table.css
+++ b/theme/table.css
@@ -39,3 +39,13 @@
 		}
 	}
 }
+
+/* Text alignment of the table header should match the editor settings and override the native browser styling,
+when content is available outside the ediitor. See https://github.com/ckeditor/ckeditor5/issues/6638 */
+.ck-content[dir="rtl"] .table th {
+	text-align: right;
+}
+
+.ck-content[dir="ltr"] .table th {
+	text-align: left;
+}