diff --git a/public/index.html b/public/index.html
index d31c2c4..d382269 100644
--- a/public/index.html
+++ b/public/index.html
@@ -1,59 +1,62 @@
 <!DOCTYPE html>
 <html lang="en">
-  <head>
-    <meta charset="utf-8" />
-    <link rel="icon" href="%PUBLIC_URL%/favicon.ico" />
-    <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <meta name="theme-color" content="#000000" />
-    <meta
-      name="description"
-      content="Online version of Pheatures Spreadsheet, originally developed by Floris van Vugt and Bruce Hayes at UCLA"
-    />
-    <!-- <link rel="apple-touch-icon" href="%PUBLIC_URL%/logo192.png" /> -->
-    <!--
-      manifest.json provides metadata used when your web app is installed on a
-      user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
-    -->
-    <link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
-    <!--
-      Notice the use of %PUBLIC_URL% in the tags above.
-      It will be replaced with the URL of the `public` folder during the build.
-      Only files inside the `public` folder can be referenced from the HTML.
+	<head>
+		<meta charset="utf-8" />
+		<link rel="icon" href="%PUBLIC_URL%/favicon.ico" />
+		<meta name="viewport" content="width=device-width, initial-scale=1" />
+		<meta name="theme-color" content="#000000" />
+		<meta
+			name="description"
+			content="Online version of Pheatures Spreadsheet, originally developed by Floris van Vugt and Bruce Hayes at UCLA"
+		/>
+		<!-- <link rel="apple-touch-icon" href="%PUBLIC_URL%/logo192.png" /> -->
+		<!--
+			manifest.json provides metadata used when your web app is installed on a
+			user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
+		-->
+		<link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
+		<!--
+			Notice the use of %PUBLIC_URL% in the tags above.
+			It will be replaced with the URL of the `public` folder during the build.
+			Only files inside the `public` folder can be referenced from the HTML.
 
-      Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
-      work correctly both with client-side routing and a non-root public URL.
-      Learn how to configure a non-root public URL by running `npm run build`.
-    -->
-    <title>Pheatures Spreadsheet Online</title>
+			Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
+			work correctly both with client-side routing and a non-root public URL.
+			Learn how to configure a non-root public URL by running `npm run build`.
+		-->
+		<title>Pheatures Spreadsheet Online</title>
 
-    <!-- Adobe Fonts -->
-    <link rel="stylesheet" href="https://use.typekit.net/ggs6pzp.css" />
+		<!-- Adobe Fonts -->
+		<link rel="stylesheet" href="https://use.typekit.net/ggs6pzp.css" />
 
-    <!-- Global site tag (gtag.js) - Google Analytics -->
-    <script async src="https://www.googletagmanager.com/gtag/js?id=G-0M8TE2989D"></script>
-    <script>
-      if (window.location.hostname === "taesungh.github.io") {
-        window.dataLayer = window.dataLayer || [];
-        function gtag() {
-          dataLayer.push(arguments);
-        }
-        gtag("js", new Date());
-        gtag("config", "G-0M8TE2989D");
-      }
-    </script>
-  </head>
-  <body>
-    <noscript>You need to enable JavaScript to run this app.</noscript>
-    <div id="root"></div>
-    <!--
-      This HTML file is a template.
-      If you open it directly in the browser, you will see an empty page.
+		<!-- Global site tag (gtag.js) - Google Analytics -->
+		<script
+			async
+			src="https://www.googletagmanager.com/gtag/js?id=G-0M8TE2989D"
+		></script>
+		<script>
+			if (window.location.hostname === "taesungh.github.io") {
+				window.dataLayer = window.dataLayer || [];
+				function gtag() {
+					dataLayer.push(arguments);
+				}
+				gtag("js", new Date());
+				gtag("config", "G-0M8TE2989D");
+			}
+		</script>
+	</head>
+	<body>
+		<noscript>You need to enable JavaScript to run this app.</noscript>
+		<div id="root"></div>
+		<!--
+			This HTML file is a template.
+			If you open it directly in the browser, you will see an empty page.
 
-      You can add webfonts, meta tags, or analytics to this file.
-      The build step will place the bundled scripts into the <body> tag.
+			You can add webfonts, meta tags, or analytics to this file.
+			The build step will place the bundled scripts into the <body> tag.
 
-      To begin the development, run `npm start` or `yarn start`.
-      To create a production bundle, use `npm run build` or `yarn build`.
-    -->
-  </body>
+			To begin the development, run `npm start` or `yarn start`.
+			To create a production bundle, use `npm run build` or `yarn build`.
+-->
+	</body>
 </html>
diff --git a/public/manifest.json b/public/manifest.json
index 6856889..6c00a55 100644
--- a/public/manifest.json
+++ b/public/manifest.json
@@ -1,25 +1,25 @@
 {
-  "short_name": "Pheatures",
-  "name": "Pheatures Spreadsheet Online",
-  "icons": [
-    {
-      "src": "favicon.ico",
-      "sizes": "64x64 32x32 24x24 16x16",
-      "type": "image/x-icon"
-    },
-    {
-      "src": "logo192.png",
-      "type": "image/png",
-      "sizes": "192x192"
-    },
-    {
-      "src": "logo512.png",
-      "type": "image/png",
-      "sizes": "512x512"
-    }
-  ],
-  "start_url": ".",
-  "display": "standalone",
-  "theme_color": "#000000",
-  "background_color": "#ffffff"
+	"short_name": "Pheatures",
+	"name": "Pheatures Spreadsheet Online",
+	"icons": [
+		{
+			"src": "favicon.ico",
+			"sizes": "64x64 32x32 24x24 16x16",
+			"type": "image/x-icon"
+		},
+		{
+			"src": "logo192.png",
+			"type": "image/png",
+			"sizes": "192x192"
+		},
+		{
+			"src": "logo512.png",
+			"type": "image/png",
+			"sizes": "512x512"
+		}
+	],
+	"start_url": ".",
+	"display": "standalone",
+	"theme_color": "#000000",
+	"background_color": "#ffffff"
 }
