Set z-index for .converse-chatboxes

css/converse.css

@@ -6783,6 +6783,7 @@ body.reset {
   display: block;
   z-index: 1031; }
   #conversejs .converse-chatboxes {
+    z-index: 1031;
     position: fixed;
     bottom: 0;
     height: auto;

css/inverse.css

@@ -6783,6 +6783,7 @@ body.reset {
   display: block;
   z-index: 1031; }
   #conversejs .converse-chatboxes {
+    z-index: 1031;
     position: fixed;
     bottom: 0;
     height: auto;

sass/_core.scss

@@ -50,6 +50,7 @@ body.reset {
     z-index: 1031; // One more than bootstrap navbar
 
     .converse-chatboxes {
+        z-index: 1031; // One more than bootstrap navbar
         position: fixed;
         bottom: 0;
         height: auto;