scrollable panels works better with perfect-scrollbar

package.json

@@ -117,6 +117,8 @@
     "brace": "^0.10.0",
     "classnames": "^2.2.5",
     "clipboard": "^1.7.1",
+    "d3": "^4.11.0",
+    "d3-scale-chromatic": "^1.1.1",
     "eventemitter3": "^2.0.2",
     "file-saver": "^1.3.3",
     "gemini-scrollbar": "https://github.com/grafana/gemini-scrollbar#grafana",
@@ -125,6 +127,7 @@
     "moment": "^2.18.1",
     "mousetrap": "^1.6.0",
     "ngreact": "^0.4.1",
+    "perfect-scrollbar": "^1.2.0",
     "prop-types": "^15.6.0",
     "react": "^16.0.0",
     "react-dom": "^16.0.0",
@@ -134,8 +137,6 @@
     "rxjs": "^5.4.3",
     "tether": "^1.4.0",
     "tether-drop": "https://github.com/torkelo/drop",
-    "tinycolor2": "^1.4.1",
-    "d3": "^4.11.0",
-    "d3-scale-chromatic": "^1.1.1"
+    "tinycolor2": "^1.4.1"
   }
 }