color changes after upstream kibana color changes

src/vendor/bootstrap/less/grafana.less

@@ -1,3 +1,10 @@
+// Global color overrides
+// ---------------------------------------------------------
+//@grayDark:              #3A3F44;
+//@grayDarker:            #272B30;
+@grayDark:              #303030;
+@grayLighter:           #BBBFC2;
+
 .grafana-dashboard-hide-controls {
   padding: 0;
   .extra, .grafana-row {
@@ -103,7 +110,7 @@
   outline: 1px solid #101214;
   border-top: 1px solid #3e444c;
   padding: 0 10px;
-  background: #202328;
+  background: @kibanaPanelBackground;
 }
 
 .grafana-legend-container {