refactor(todo-app): minor refinements

Author: azinit

todo-app/src/app/styles/normalize.scss

@@ -10,6 +10,21 @@ html {
     scroll-behavior: smooth;
 }
 
+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;
+}
+  
+
 // scrollbar
 ::-webkit-scrollbar {
     width: 8px;

todo-app/src/index.css

@@ -1,6 +1,5 @@
 import React from 'react';
 import ReactDOM from 'react-dom';
-import './index.css';
 import App from 'app';
 import reportWebVitals from './reportWebVitals';