Add css normalization for multibrowser support

src/index.css

-body {
-  margin: 0;
-  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
-    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
-    sans-serif;
-  -webkit-font-smoothing: antialiased;
-  -moz-osx-font-smoothing: grayscale;
-}
-
-code {
-  font-family: source-code-pro, Menlo, Monaco, Consolas, 'Courier New',
-    monospace;
-}

src/index.tsx

 import React from 'react';
 import ReactDOM from 'react-dom';
 import { IntlProvider } from 'react-intl';
+import CssBaseline from '@material-ui/core/CssBaseline';
 import MESSAGES_EN from './intl/en.json';
-import './index.css';
 import { App } from './App';
 
 ReactDOM.render(
   <React.StrictMode>
     <IntlProvider locale="en" messages={MESSAGES_EN}>
+      <CssBaseline />
       <App />
     </IntlProvider>
     ,