diff --git a/.prettierignore b/.prettierignore
new file mode 100644
index 0000000..2bf6741
--- /dev/null
+++ b/.prettierignore
@@ -0,0 +1 @@
+**/*.html
diff --git a/index.html b/index.html
index 14c5e36..f55bf01 100644
--- a/index.html
+++ b/index.html
@@ -22,21 +22,10 @@
     <meta name="twitter:card" content="summary_large_image" />
     <meta name="twitter:site" content="@bc_rikko" />
     <meta name="twitter:creator" content="@bc_rikko" />
-    <meta
-      name="twitter:image"
-      content="https://user-images.githubusercontent.com/5305599/45937791-a5db2100-bffe-11e8-8bfd-fc3f534b28aa.gif"
-    />
+    <meta name="twitter:image" content="https://user-images.githubusercontent.com/5305599/45937791-a5db2100-bffe-11e8-8bfd-fc3f534b28aa.gif" />
 
     <script async src="https://www.googletagmanager.com/gtag/js?id=UA-41640153-4"></script>
-    <script>
-      window.dataLayer = window.dataLayer || [];
-      function gtag() {
-        dataLayer.push(arguments);
-      }
-      gtag("js", new Date());
-
-      gtag("config", "UA-41640153-4");
-    </script>
+    <script>window.dataLayer=window.dataLayer||[];function gtag(){dataLayer.push(arguments);}gtag("js", new Date());gtag("config", "UA-41640153-4");</script>
   </head>
 
   <body>
@@ -72,33 +61,52 @@
     </div>
 
     <div>
-      <label><input type="radio" class="radio" name="answer" checked /><span>Yes</span></label>
-      <label><input type="radio" class="radio" name="answer" /><span>No</span></label>
+      <label>
+        <input type="radio" class="radio" name="answer" checked />
+        <span>Yes</span>
+      </label>
+      <label>
+        <input type="radio" class="radio" name="answer" />
+        <span>No</span>
+      </label>
     </div>
 
     <div>
-      <label><input type="checkbox" class="checkbox" checked /><span>Enable</span></label>
+      <label>
+        <input type="checkbox" class="checkbox" checked />
+        <span>Enable</span>
+      </label>
     </div>
 
-    <div class="balloon from-left"><p>Hello NES.css</p></div>
+    <div class="balloon from-left">
+      <p>Hello NES.css</p>
+    </div>
     <div class="balloon from-right">
       <p>Good morning. Thou hast had a good night's sleep I hope.</p>
     </div>
 
-    <i class="icon heart"></i> <i class="icon heart is-medium"></i>
+    <i class="icon heart"></i>
+    <i class="icon heart is-medium"></i>
     <i class="icon heart is-large"></i>
 
-    <i class="icon star"></i> <i class="icon star is-medium"></i> <i class="icon star is-large"></i>
+    <i class="icon star"></i>
+    <i class="icon star is-medium"></i>
+    <i class="icon star is-large"></i>
 
-    <i class="icon like"></i> <i class="icon like is-medium"></i> <i class="icon like is-large"></i>
+    <i class="icon like"></i>
+    <i class="icon like is-medium"></i>
+    <i class="icon like is-large"></i>
 
-    <i class="icon twitter"></i> <i class="icon twitter is-medium"></i>
+    <i class="icon twitter"></i>
+    <i class="icon twitter is-medium"></i>
     <i class="icon twitter is-large"></i>
 
-    <i class="icon facebook"></i> <i class="icon facebook is-medium"></i>
+    <i class="icon facebook"></i>
+    <i class="icon facebook is-medium"></i>
     <i class="icon facebook is-large"></i>
 
-    <i class="icon github"></i> <i class="icon github is-medium"></i>
+    <i class="icon github"></i>
+    <i class="icon github is-medium"></i>
     <i class="icon github is-large"></i>
 
     <i class="octocat animate"></i>
