Expand inheritance overrides demo

Author: markdalgleish

src/components/4-InheritanceOverrides/InheritanceOverridesDemo.js

@@ -4,14 +4,18 @@ import React, { Component } from 'react';
 
 import js from '!!raw!./InheritanceOverrides.js';
 import css from '!!raw!./InheritanceOverrides.css';
+import layoutCss from '!!raw!shared/styles/layout.css';
+import typographyCss from '!!raw!shared/styles/typography.css';
 import Snippet from 'shared/Snippet/Snippet';
 
 export default class InheritanceOverridesDemo extends Component {
 
   render() {
     const files = [
       { name: 'InheritanceOverrides.js', source: js },
-      { name: 'InheritanceOverrides.css', source: css }
+      { name: 'InheritanceOverrides.css', source: css },
+      { name: 'shared/styles/layout.css', source: layoutCss },
+      { name: 'shared/styles/typography.css', source: typographyCss }
     ];
 
     return (