diff --git a/theme/boost/scss/moodle/message.scss b/theme/boost/scss/moodle/message.scss
index fc90303184d..bc3b0595282 100644
--- a/theme/boost/scss/moodle/message.scss
+++ b/theme/boost/scss/moodle/message.scss
@@ -652,21 +652,6 @@
     }
 }
 
-#newmessageoverlay {
-    @extend .card;
-    margin: 0 1em;
-    position: fixed;
-    bottom: 0;
-    right: 0;
-}
-#newmessageoverlay #usermessage {
-    padding: 10px;
-}
-/* Widen the plain text editor on the bulk message screen */
-#page-user-action_redir #edit-messagebody {
-    width: auto;
-}
-
 .preferences-container {
     .container-fluid {
         padding: 0;
@@ -1001,30 +986,6 @@
     }
 }
 
-.dir-rtl {
-    .messaging-area-container {
-        .messaging-area {
-            .contacts-area {
-                .contacts {
-                    .contact {
-                        .picture {
-                            float: right;
-                        }
-
-                        .information {
-                            float: right;
-                        }
-
-                        .unread-count-container {
-                            float: right;
-                        }
-                    }
-                }
-            }
-        }
-    }
-}
-
 @media (max-width: 979px) {
     .messaging-area-container {
         .messaging-area {
diff --git a/theme/bootstrapbase/less/moodle/message.less b/theme/bootstrapbase/less/moodle/message.less
index 57fe568aedb..44c691f5ca4 100644
--- a/theme/bootstrapbase/less/moodle/message.less
+++ b/theme/bootstrapbase/less/moodle/message.less
@@ -638,21 +638,6 @@
     }
 }
 
-#newmessageoverlay {
-    .well;
-    margin: 0 1em;
-    position: fixed;
-    bottom: 0;
-    right: 0;
-}
-#newmessageoverlay #usermessage {
-    padding: 10px;
-}
-/* Widen the plain text editor on the bulk message screen */
-#page-user-action_redir #edit-messagebody {
-    width: auto;
-}
-
 .preferences-container {
     .container-fluid {
         padding: 0;
@@ -987,30 +972,6 @@
     }
 }
 
-.dir-rtl {
-    .messaging-area-container {
-        .messaging-area {
-            .contacts-area {
-                .contacts {
-                    .contact {
-                        .picture {
-                            float: right;
-                        }
-
-                        .information {
-                            float: right;
-                        }
-
-                        .unread-count-container {
-                            float: right;
-                        }
-                    }
-                }
-            }
-        }
-    }
-}
-
 @media (max-width: 979px) {
     .messaging-area-container {
         .messaging-area {
diff --git a/theme/bootstrapbase/style/moodle.css b/theme/bootstrapbase/style/moodle.css
index 6db2c9ac536..7052f402e25 100644
--- a/theme/bootstrapbase/style/moodle.css
+++ b/theme/bootstrapbase/style/moodle.css
@@ -6312,35 +6312,6 @@ a.ygtvspacer:hover {
 .messaging-area-container .messaging-area .messages-area.editing .response .message-box {
   display: none;
 }
-#newmessageoverlay {
-  min-height: 20px;
-  padding: 19px;
-  margin-bottom: 20px;
-  background-color: #f5f5f5;
-  border: 1px solid #e3e3e3;
-  -webkit-border-radius: 4px;
-  -moz-border-radius: 4px;
-  border-radius: 4px;
-  -webkit-box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.05);
-  -moz-box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.05);
-  box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.05);
-  border-color: #e3e3e3;
-  margin: 0 1em;
-  position: fixed;
-  bottom: 0;
-  right: 0;
-}
-#newmessageoverlay blockquote {
-  border-color: #ddd;
-  border-color: rgba(0, 0, 0, 0.15);
-}
-#newmessageoverlay #usermessage {
-  padding: 10px;
-}
-/* Widen the plain text editor on the bulk message screen */
-#page-user-action_redir #edit-messagebody {
-  width: auto;
-}
 .preferences-container .container-fluid {
   padding: 0;
 }
@@ -6595,15 +6566,6 @@ a.ygtvspacer:hover {
 .notification-area .content-area .footer:empty {
   display: none;
 }
-.dir-rtl .messaging-area-container .messaging-area .contacts-area .contacts .contact .picture {
-  float: right;
-}
-.dir-rtl .messaging-area-container .messaging-area .contacts-area .contacts .contact .information {
-  float: right;
-}
-.dir-rtl .messaging-area-container .messaging-area .contacts-area .contacts .contact .unread-count-container {
-  float: right;
-}
 @media (max-width: 979px) {
   .messaging-area-container .messaging-area {
     position: relative;