Fix panel heights to be even and use the entire window

bigbluebutton-html5/app/client/stylesheets/style.less

@@ -565,7 +565,7 @@ body {
     -moz-flex: 4 4 80%;
     -ms-flex: 4 4 80%;
     flex: 4 4 80%;
-    height: 99%;
+    height: 100%;
   }
   @media @mobile-portrait-with-keyboard, @desktop-portrait, @mobile-portrait {
   height: 100%;
@@ -587,7 +587,7 @@ body {
     flex-flow: column;
   }
   width: 100%;
-  height: calc(~'100% - 55px');
+  height: calc(~'100% - 50px'); // 50px for narbar height
 }
 
 .signOutIcon {
@@ -692,3 +692,7 @@ body {
 
   }
 }
+
+.top-bar {
+  line-height: 0;
+}