diff --git a/app/assets/stylesheets/actiontext-lexical.css b/app/assets/stylesheets/actiontext-lexical.css
index c84a3d954..c6ac46217 100644
--- a/app/assets/stylesheets/actiontext-lexical.css
+++ b/app/assets/stylesheets/actiontext-lexical.css
@@ -31,6 +31,12 @@
         position: absolute;
         white-space: pre-line;
       }
+
+      /* Disable the submit button when Lexical is empty */
+      + .comment__submit {
+        opacity: 0.5;
+        pointer-events: none;
+      }
     }
   }