Hide the textarea resize handle

css/converse.css

@@ -7620,6 +7620,9 @@ body.reset {
       left: 0; }
 
 /* ******************* Overlay and embedded styles *************************** */
+#conversejs.converse-embedded .chat-textarea {
+  max-height: 15em; }
+
 #conversejs.converse-embedded .chat-head,
 #conversejs.converse-overlayed .chat-head {
   border-top-left-radius: 4px;
@@ -7701,7 +7704,7 @@ body.reset {
     flex: 0 0 16.6666666667%;
     max-width: 16.6666666667%; }
 #conversejs.converse-fullscreen .chat-textarea {
-  max-height: 400px; }
+  max-height: 15em; }
 #conversejs.converse-fullscreen .emoji-picker {
   height: 150px; }
 #conversejs.converse-fullscreen .chatbox {
@@ -8677,7 +8680,8 @@ body.reset {
       color: #E77051; }
   #conversejs.converse-embedded .chatroom .sendXMPPMessage .chat-textarea,
   #conversejs .chatroom .sendXMPPMessage .chat-textarea {
-    border-bottom-right-radius: 0; }
+    border-bottom-right-radius: 0;
+    resize: none; }
     #conversejs.converse-embedded .chatroom .sendXMPPMessage .chat-textarea.correcting,
     #conversejs .chatroom .sendXMPPMessage .chat-textarea.correcting {
       background-color: #fadfd7; }

sass/_chatbox.scss

@@ -438,6 +438,12 @@
 
 /* ******************* Overlay and embedded styles *************************** */
 
+#conversejs.converse-embedded {
+    .chat-textarea {
+        max-height: $fullpage-max-chat-textarea-height;
+    }
+}
+
 #conversejs.converse-embedded,
 #conversejs.converse-overlayed {
     .chat-head {

sass/_chatrooms.scss

@@ -271,6 +271,7 @@
             }
             .chat-textarea {
                 border-bottom-right-radius: 0;
+                resize: none;
                 &.correcting {
                     background-color: lighten($chatroom-head-color, 30%);
                 }

sass/_variables.scss

@@ -146,7 +146,7 @@ $fullpage-chat-head-height: 62px !default;
 $fullpage-chat-height: 100vh;
 $fullpage-chat-width: 100%;
 $fullpage-emoji-picker-height: 150px !default;
-$fullpage-max-chat-textarea-height: 400px !default;
+$fullpage-max-chat-textarea-height: 15em!default;
 
 $overlayed-chat-head-height: 55px !default;
 $overlayed-chat-height: 450px !default;