feat(texture): add background texture

src/index.tsx

@@ -2,6 +2,7 @@ import * as React from 'react'
 import * as ReactDOM from 'react-dom'
 import App from './App'
 import './css/index.css'
+import './texture.png'
 import './fonts'
 import registerServiceWorker from './registerServiceWorker'
 

src/scss/components/_main.scss

@@ -1,5 +1,6 @@
 main {
   transition: background-color 2s ease-out;
+  background-image: url('../texture.png');
   ul.none-style {
     list-style: none;
     -webkit-padding-start: 0;