give fc-content border color if it wants it

src/common/common.css

@@ -28,6 +28,7 @@ body .fc { /* extra precedence to overcome jqui */
 .fc-unthemed tbody,
 .fc-unthemed .fc-divider,
 .fc-unthemed .fc-row,
+.fc-unthemed .fc-content, /* for gutter border */
 .fc-unthemed .fc-popover {
 	border-color: #ddd;
 }