Chat is now fullscreen when displayed

src/html/member.html

@@ -9,6 +9,7 @@
   </ldp-router>
 
   <hd-chat-window
+      id="chat-singleton"
       data-authentication="anonymous"
       data-auto-login="true"
       data-bosh-service-url="https://conversejs.org/http-bind/"

src/scss/_mixins.scss

@@ -68,3 +68,15 @@
     display: table;
   }
 }
+
+hd-chat-window {
+  position:       absolute;
+  top:            0px;
+  bottom:         0px;
+  left:           0px;
+  right:          0px;
+  margin:         auto;
+  padding-top:    $menu-height;
+  padding-right:  $vertical-menu-width;
+  display:        block;
+}

src/scss/_styles.scss

@@ -8,7 +8,7 @@ html, body, #mainContainer {
 }
 
 #mainContainer {
-  margin-top:   $menu-height;
+  padding-top:   $menu-height;
 }
 
 .page-title {