diff --git a/web/index.html b/web/index.html
index d8ae200..7f4b189 100644
--- a/web/index.html
+++ b/web/index.html
@@ -1,69 +1,90 @@
 <!DOCTYPE html>
 
 <html>
-
-<head>
+  <head>
     <meta charset="utf-8" />
     <meta lang="en" />
     <meta http-equiv="X-UA-Compatible" content="IE=edge" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <meta name="scaffolded-by" content="https://github.com/google/stagehand" />
     <title>json2dart_for_json_serializable</title>
-    <link rel="stylesheet" href="styles.css">
-    <link rel="icon" href="favicon.ico">
+    <link rel="stylesheet" href="styles.css" />
+    <link rel="icon" href="favicon.ico" />
     <script defer src="main.dart.js"></script>
-</head>
+  </head>
 
-<body>
+  <body>
     <div class="lang">
-        <a href="index_ch.html">中文</a>
-        <a href="https://github.com/caijinglong/json2dart">
-            <img src="github_logo.jpg" width="50px" />
-        </a>
+      <a href="index_ch.html">中文</a>
+      <a href="https://github.com/caijinglong/json2dart">
+        <img src="github_logo.jpg" width="50px" />
+      </a>
     </div>
     <div>
-        <h1>simple use
-            <a href="https://pub.dartlang.org/packages/json_serializable" target="_blank">json_serializable</a>
-        </h1>
-        <div class="version">
-            <input class="version" type="radio" value="0" name="version" id="v0" checked="true">v0.x.x</input>
-            <input class="version" type="radio" value="1" name="version" id="v1">v1.x.x</input>
+      <h1>
+        simple use
+        <a
+          href="https://pub.dartlang.org/packages/json_serializable"
+          target="_blank"
+          >json_serializable</a
+        >
+      </h1>
+      <div class="version">
+        <input
+          class="version"
+          type="radio"
+          value="0"
+          name="version"
+          id="v0"
+          checked="true"
+        /><label for="v0">v0.x.x</label>
+        <input
+          class="version"
+          type="radio"
+          value="1"
+          name="version"
+          id="v1"
+        /><label for="v1">v1.x.x</label>
+      </div>
+      <div>
+        <div class="title">
+          <span class="half_span">copy your json to left textarea</span>
+          <span class="half_span">
+            <div class="result_title">
+              dart class name
+              <input id="out_entity_name" />
+              <input type="checkbox" id="use_json_key" />
+              <span id="check_label">jsonKey annotation</span>
+              <input type="checkbox" id="camelCase" />
+              <span id="camelCaseLabel">use camelCase</span>
+              <input type="checkbox" id="use_static" />
+              <span id="useStaticLabel">use static</span>
+            </div>
+            <div id="file_name"></div>
+          </span>
         </div>
-        <div>
-            <div class="title">
-                <span class="half_span">copy your json to left textarea</span>
-                <span class="half_span">
-                    <div class="result_title">
-                        dart class name
-                        <input id="out_entity_name" />
-                        <input type="checkbox" id="use_json_key" />
-                        <span id="check_label">jsonKey annotation</span>
-                        <input type="checkbox" id="camelCase" />
-                        <span id="camelCaseLabel">use camelCase</span>
-                        <input type="checkbox" id="use_static" />
-                        <span id="useStaticLabel">use static</span>
-                    </div>
-                    <div id="file_name"></div>
-                </span>
-            </div>
-            <div class="content">
-                <span class="half_span">
-                    <textarea id="json" title="json" class="content_area"></textarea>
-                </span>
-                <span class="half_span">
-                    <textarea id="result" title="result" class="content_area"></textarea>
-                </span>
-            </div>
-            <div class="func">
-                <span class="half_span">
-                    <button id="format">format</button>
-                </span>
-                <span class="half_span">
-                    <button id="copy">copy</button>
-                    <button id="save">download</button>
-                </span>
-            </div>
+        <div class="content">
+          <span class="half_span">
+            <textarea id="json" title="json" class="content_area"></textarea>
+          </span>
+          <span class="half_span">
+            <textarea
+              id="result"
+              title="result"
+              class="content_area"
+            ></textarea>
+          </span>
         </div>
-</body>
-
-</html>
\ No newline at end of file
+        <div class="func">
+          <span class="half_span">
+            <button id="format">format</button>
+          </span>
+          <span class="half_span">
+            <button id="copy">copy</button>
+            <button id="save">download</button>
+          </span>
+        </div>
+      </div>
+    </div>
+  </body>
+</html>
diff --git a/web/index_ch.html b/web/index_ch.html
index add6b8e..85b3a19 100644
--- a/web/index_ch.html
+++ b/web/index_ch.html
@@ -1,70 +1,88 @@
 <!DOCTYPE html>
 
 <html>
-
-<head>
+  <head>
     <meta charset="utf-8" />
     <meta lang="zh-CN" />
     <meta http-equiv="X-UA-Compatible" content="IE=edge" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <meta name="scaffolded-by" content="https://github.com/google/stagehand" />
     <title>json2dart_for_json_serializable</title>
-    <link rel="stylesheet" href="styles.css">
-    <link rel="icon" href="favicon.ico">
+    <link rel="stylesheet" href="styles.css" />
+    <link rel="icon" href="favicon.ico" />
     <script defer src="main.dart.js"></script>
-</head>
+  </head>
 
-<body>
+  <body>
     <div class="lang">
-        <a href="index.html">English</a>
-        <a href="https://github.com/caijinglong/json2dart">
-            <img src="github_logo.jpg" width="50px" />
-        </a>
+      <a href="index.html">English</a>
+      <a href="https://github.com/caijinglong/json2dart">
+        <img src="github_logo.jpg" width="50px" />
+      </a>
     </div>
     <div>
-        <h1>为了便利使用
-            <a href="https://pub.dartlang.org/packages/json_serializable">json_serializable</a>库
-        </h1>
-        <div class="version">
-            <input class="version" type="radio" value="0" name="version" id="v0" checked="true">v0.x.x</input>
-            <input class="version" type="radio" value="1" name="version" id="v1">v1.x.x</input>
-        </div>
+      <h1>
+        为了便利使用
+        <a href="https://pub.dartlang.org/packages/json_serializable"
+          >json_serializable</a
+        >库
+      </h1>
+      <div class="version">
+        <input
+          class="version"
+          type="radio"
+          value="0"
+          name="version"
+          id="v0"
+          checked="true"
+        /><label for="v0">v0.x.x</label>
+        <input
+          class="version"
+          type="radio"
+          value="1"
+          name="version"
+          id="v1"
+        /><label for="v1">v1.x.x</label>
+      </div>
     </div>
     <div>
-        <div class="title">
-            <span class="half_span">将json粘贴至左边</span>
-            <span class="half_span">
-                <div class="result_title">
-                    类名称
-                    <input id="out_entity_name" />
-                    <input type="checkbox" id="use_json_key" />
-                    <span id="check_label">使用 JsonKey 注解</span>
-                    <input type="checkbox" id="camelCase" />
-                    <span id="camelCaseLabel">驼峰命名</span>
-                    <input type="checkbox" id="use_static" />
-                    <span id="useStaticLabel">使用静态方法</span>
-                </div>
-                <div id="file_name"></div>
-            </span>
-        </div>
-        <div class="content">
-            <span class="half_span">
-                <textarea id="json" title="json字符串" class="content_area"></textarea>
-            </span>
-            <span class="half_span">
-                <textarea id="result" title="结果" class="content_area"></textarea>
-            </span>
-        </div>
-        <div class="func">
-            <span class="half_span">
-                <button id="format">格式化</button>
-            </span>
-            <span class="half_span">
-                <button id="copy">复制</button>
-                <button id="save">下载</button>
-            </span>
-        </div>
+      <div class="title">
+        <span class="half_span">将json粘贴至左边</span>
+        <span class="half_span">
+          <div class="result_title">
+            类名称
+            <input id="out_entity_name" />
+            <input type="checkbox" id="use_json_key" />
+            <span id="check_label">使用 JsonKey 注解</span>
+            <input type="checkbox" id="camelCase" />
+            <span id="camelCaseLabel">驼峰命名</span>
+            <input type="checkbox" id="use_static" />
+            <span id="useStaticLabel">使用静态方法</span>
+          </div>
+          <div id="file_name"></div>
+        </span>
+      </div>
+      <div class="content">
+        <span class="half_span">
+          <textarea
+            id="json"
+            title="json字符串"
+            class="content_area"
+          ></textarea>
+        </span>
+        <span class="half_span">
+          <textarea id="result" title="结果" class="content_area"></textarea>
+        </span>
+      </div>
+      <div class="func">
+        <span class="half_span">
+          <button id="format">格式化</button>
+        </span>
+        <span class="half_span">
+          <button id="copy">复制</button>
+          <button id="save">下载</button>
+        </span>
+      </div>
     </div>
-</body>
-
-</html>
\ No newline at end of file
+  </body>
+</html>
