Don't set min width since the chatbox is now reponsive

css/converse.css

@@ -5418,8 +5418,7 @@
     margin: 0;
     padding: 0;
     position: relative;
-    height: 95px;
-    min-width: 200px; }
+    height: 95px; }
     @media screen and (max-height: 450px) {
       #converse-embedded-chat .chatbox .sendXMPPMessage,
       #conversejs .chatbox .sendXMPPMessage {

css/inverse.css

@@ -5474,8 +5474,7 @@ body {
     margin: 0;
     padding: 0;
     position: relative;
-    height: 99px;
-    min-width: 100%; }
+    height: 99px; }
     @media screen and (max-height: 450px) {
       #converse-embedded-chat .chatbox .sendXMPPMessage,
       #conversejs .chatbox .sendXMPPMessage {

sass/_chatbox.scss

@@ -245,7 +245,6 @@
             padding: 0;
             position: relative;
             height: #{$chat-textarea-height + $toolbar-height};
-            min-width: $chat-width;
             @media screen and (max-height: $mobile-landscape-height) {
                 width: 100%;
             }