Added storybook css

Author: wintondeshong

.storybook/config.js

@@ -2,6 +2,7 @@ import { configure, addParameters, addDecorator } from "@storybook/react";
 import { setDefaults } from "@storybook/addon-info";
 import { withInfo } from "@storybook/addon-info";
 import { withKnobs } from "@storybook/addon-knobs";
+import "./storybook.css";
 
 // -----------------------------------------------------------------------------------------
 // #region Constants

.storybook/storybook.css

@@ -0,0 +1,5 @@
+div#story-root {
+    position: relative;
+    margin: 10px 40px;
+    background: #ffffff;
+}