diff --git a/web/styles/compose.css b/web/styles/compose.css
index 5853385b30..b15876984d 100644
--- a/web/styles/compose.css
+++ b/web/styles/compose.css
@@ -2027,14 +2027,19 @@ textarea.new_message_textarea {
         }
     }
 
+    .message-textarea,
     .message-edit-textbox {
         /* In preview mode, we hide the message edit
            textbox to prevent it from appearing behind
            the preview container. We cannot set its
            display to none or visibility to hidden, as
            that would prevent us from modifying the
-           textarea's value. */
-        height: 0;
-        overflow: hidden;
+           textarea's value.
+
+           The !important use here in necessary to be sure
+           we override the inline styles set on the
+           compose textarea. */
+        height: 0 !important;
+        overflow: hidden !important;
     }
 }