Index: openacs-4/packages/xowiki/www/resources/chat.css
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xowiki/www/resources/Attic/chat.css,v
diff -u -r1.8 -r1.9
--- openacs-4/packages/xowiki/www/resources/chat.css	26 Nov 2018 16:25:53 -0000	1.8
+++ openacs-4/packages/xowiki/www/resources/chat.css	26 Nov 2018 17:10:52 -0000	1.9
@@ -92,7 +92,7 @@
     -ms-hyphens: auto;
     -moz-hyphens: auto;
     hyphens: auto;
-    min-width: 0px; // See https://github.com/philipwalton/flexbugs/issues/39
+    min-width: 0; // See https://github.com/philipwalton/flexbugs/issues/39
 }
 
 #xowiki-chat-messages {
@@ -179,6 +179,7 @@
     background-color: #eceff1;
     border-radius: 8px;
     padding-right: 45px;
+    min-width: 0; // Avoid overlapping when screen width is very small
 }
 
 #xowiki-chat-send-button {
@@ -206,6 +207,10 @@
 }
 
 /* Full screen trigger */
+.xowiki-chat-trigger-fs-block {
+    min-width: 0; // Avoid overlapping when screen width is very small
+}
+
 .xowiki-chat-trigger-fs-pic {
     width: 40px;
     height: 40px;