thumbnail tool init

docs/thumbnail/index.html

@@ -2,12 +2,12 @@
 <html>
 
 <head>
-    <title>ArtPlayer.js thumbnail maker</title>
+    <title>Thumbnail tool for ArtPlayer</title>
     <meta charset="UTF-8">
     <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
     <meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
-    <meta name="keywords" content="artplayer,html5,video,player">
-    <meta name="description" content="ArtPlayer is a modern HTML5 video player">
+    <meta name="keywords" content="artplayer,html5,video,player,thumbnail">
+    <meta name="description" content="Thumbnail tool for ArtPlayer">
     <link rel="shortcut icon" href="./img/favicon.ico">
     <link rel="stylesheet" href="./css/normalize.css">
     <link rel="stylesheet" href="./css/common.css">
@@ -17,7 +17,7 @@
 
 <body>
     <div class="container">
-        artplayer-tool-thumbnail
+        <div class="artplayer-tool-thumbnail"></div>
     </div>
     <script src="../uncompiled/artplayer.js"></script>
     <script src="../uncompiled/artplayer-tool-thumbnail.js"></script>