diff --git a/lib/docsify.js b/lib/docsify.js
index 18d0e86..f77b9c3 100644
--- a/lib/docsify.js
+++ b/lib/docsify.js
@@ -2114,7 +2114,7 @@ Prism.languages.js = Prism.languages.javascript;
 /**
  * @link from https://github.com/killercup/grock/blob/5280ae63e16c5739e9233d9009bc235ed7d79a50/styles/solarized/assets/js/behavior.coffee#L54-L81
  */
-var tocToTree = function (toc) {
+var tocToTree = function (toc, maxLevel) {
   var headlines = [];
   var last = {};
 
@@ -2122,6 +2122,7 @@ var tocToTree = function (toc) {
     var level = headline.level || 1;
     var len = level - 1;
 
+    if (level > maxLevel) { return }
     if (last[len]) {
       last[len].children = last[len].children || [];
       last[len].children.push(headline);
@@ -2149,10 +2150,9 @@ var buildHeadlinesTree = function (tree, tpl) {
   return tpl
 };
 
-var genToc = function (toc) {
-  var tree = tocToTree(toc);
-  var result = buildHeadlinesTree(tree, '<ul>');
-  return result
+var genToc = function (toc, maxLevel) {
+  var tree = tocToTree(toc, maxLevel);
+  return buildHeadlinesTree(tree, '<ul>')
 };
 
 var cornerTpl = "\n  <a href=\"{{repo}}\" class=\"github-corner\" aria-label=\"View source on Github\">\n    <svg viewBox=\"0 0 250 250\" aria-hidden=\"true\">\n      <path d=\"M0,0 L115,115 L130,115 L142,142 L250,250 L250,0 Z\"></path>\n      <path d=\"M128.3,109.0 C113.8,99.7 119.0,89.6 119.0,89.6 C122.0,82.7 120.5,78.6 120.5,78.6 C119.2,72.0 123.4,76.3 123.4,76.3 C127.3,80.9 125.5,87.3 125.5,87.3 C122.9,97.6 130.6,101.9 134.4,103.2\" fill=\"currentColor\" style=\"transform-origin: 130px 106px;\" class=\"octo-arm\"></path>\n      <path d=\"M115.0,115.0 C114.9,115.1 118.7,116.5 119.8,115.4 L133.7,101.6 C136.9,99.2 139.9,98.4 142.2,98.6 C133.8,88.0 127.5,74.4 143.8,58.0 C148.5,53.4 154.0,51.2 159.7,51.0 C160.3,49.4 163.2,43.6 171.4,40.1 C171.4,40.1 176.1,42.5 178.8,56.2 C183.1,58.6 187.2,61.8 190.9,65.4 C194.5,69.0 197.7,73.2 200.1,77.6 C213.8,80.2 216.3,84.9 216.3,84.9 C212.7,93.1 206.9,96.0 205.4,96.6 C205.1,102.4 203.0,107.8 198.3,112.5 C181.9,128.9 168.3,122.5 157.7,114.1 C157.9,116.9 156.7,120.9 152.7,124.9 L141.0,136.5 C139.8,137.7 141.6,141.9 141.8,141.8 Z\" fill=\"currentColor\" class=\"octo-body\"></path>\n    </svg>\n  </a>\n";
@@ -2190,7 +2190,7 @@ var render = function (content, opts) {
   }
 
   var section = "<section class=\"content\">\n    <article class=\"markdown-section\">" + (marked(content)) + "</article>\n  </section>";
-  var sidebar = "<aside class=\"sidebar\">" + (genToc(toc)) + "</aside>";
+  var sidebar = "<aside class=\"sidebar\">" + (genToc(toc, opts['max-level'])) + "</aside>";
 
   return (corner + "<main>" + sidebar + section + "</main>")
 };
@@ -2217,6 +2217,8 @@ function scrollActiveSidebar () {
 
       if (bcr.top < 10 && bcr.bottom > 10) {
         var li = nav[node.id];
+
+        if (!li) { return }
         if (li === active) { return }
         if (active) { active.setAttribute('class', ''); }
 
@@ -2249,7 +2251,8 @@ var bindEvent = function () {
 
 var DEFAULT_OPTS = {
   el: '#app',
-  repo: ''
+  repo: '',
+  'max-level': 6
 };
 
 var script = document.currentScript || [].slice.call(document.getElementsByTagName('script')).pop();
diff --git a/lib/docsify.min.js b/lib/docsify.min.js
index 9d942f6..041b409 100644
--- a/lib/docsify.min.js
+++ b/lib/docsify.min.js
@@ -1 +1 @@
-!function(e,t){"object"==typeof exports&&"undefined"!=typeof module?module.exports=t():"function"==typeof define&&define.amd?define(t):e.Docsify=t()}(this,function(){"use strict";function e(e,t){return t={exports:{}},e(t,t.exports),t.exports}function t(){function e(){for(var e=0,t=n.length;e<t;e+=1){var i=n[e].parentNode,a=i.getBoundingClientRect();if(a.top<10&&a.bottom>10){var o=r[i.id];if(o===s)return;return s&&s.setAttribute("class",""),o.setAttribute("class","active"),void(s=o)}}}function t(){var e=window.location.hash.slice(1);if(e){var t=document.querySelector("#"+e);t&&t.scrollIntoView()}}if(!/mobile/i.test(navigator.userAgent)){for(var n=document.querySelectorAll(".anchor"),r={},i=document.querySelectorAll(".sidebar li"),s=null,a=0,o=i.length;a<o;a+=1){var l=i[a],u=l.querySelector("a");r[u.getAttribute("href").slice(1)]=l}document.querySelector("main .content").addEventListener("scroll",e),e(),window.addEventListener("hashchange",t),t()}}var n=function(e,t){void 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diff --git a/lib/themes/buble.css b/lib/themes/buble.css
new file mode 100644
index 0000000..25d5a70
--- /dev/null
+++ b/lib/themes/buble.css
@@ -0,0 +1 @@
+@import url('https://fonts.googleapis.com/css?family=Inconsolata|Inconsolata-Bold');*{box-sizing:border-box;-webkit-overflow-scrolling:touch;-webkit-tap-highlight-color:rgba(0,0,0,0);-webkit-text-size-adjust:none;-webkit-touch-callout:none;-webkit-font-smoothing:antialiased}nav{position:absolute;right:0;left:0;z-index:2;margin:25px 60px 0 0;text-align:right}nav a{margin:0 1em;padding:5px 0;font-size:16px;text-decoration:none;color:inherit;transition:color .3s}nav a.active,nav a:hover{color:#0074d9}nav a.active{border-bottom:2px solid #0074d9}.github-corner{position:absolute;top:0;right:0;z-index:2}.github-corner svg{color:#fff;fill:#0074d9;height:80px;width:80px}.github-corner:hover .octo-arm{animation:a .56s ease-in-out}@keyframes a{0%,to{transform:rotate(0)}20%,60%{transform:rotate(-25deg)}40%,80%{transform:rotate(10deg)}}@media (max-width:500px){.github-corner:hover .octo-arm{animation:none}.github-corner .octo-arm{animation:a .56s ease-in-out}}body,html{height:100%}body{-moz-osx-font-smoothing:grayscale;-webkit-font-smoothing:antialiased;background-color:#fff;color:#34495e;font-family:Source Sans Pro,arial,sans-serif;font-weight:400px;font-size:15px;letter-spacing:0;margin:0}main{height:100%;position:relative;width:100%}.sidebar{background-color:#fff;border-right:1px solid rgba(0,0,0,.07);bottom:0;color:#364149;overflow-y:auto;position:absolute;top:0;width:14em;z-index:1;padding-top:40px}.sidebar ul{margin:0;padding:0}.sidebar ul,.sidebar ul li{list-style:none}.sidebar a{color:#666;text-decoration:none}.sidebar li{list-style:none;padding:.2em .2em .2em 1em;margin:0}.sidebar .active{background-color:#eee}.sidebar .active a{color:#333}.content{bottom:0;left:14em;overflow-y:auto;position:absolute;right:0;top:0;overflow-x:hidden;padding-top:20px}@media screen and (max-width:600px){.sidebar{left:-14em}.content{left:0}}.markdown-section{position:relative;margin:0 auto;max-width:64em;padding:20px 15px 40px}.markdown-section *{box-sizing:border-box;-webkit-box-sizing:border-box;font-size:inherit}.markdown-section>:first-child{margin-top:0!important}.markdown-section h1,.markdown-section h2,.markdown-section h3,.markdown-section h4,.markdown-section strong{font-weight:400;color:#333}.markdown-section a{color:#0074d9;font-weight:400}.markdown-section ol,.markdown-section p,.markdown-section ul{word-spacing:.05em}.markdown-section h1{margin:0 0 1em;font-size:2em;font-weight:500}.markdown-section h2{padding:1rem 0 0;margin:0 0 1rem;font-size:1.8em;font-weight:400}.markdown-section h3{margin:52px 0 1.2em;font-size:1.5em}.markdown-section h4{font-size:1.25em}.markdown-section h5{font-size:1em}.markdown-section h6{font-size:1em;color:#777}.markdown-section figure,.markdown-section ol,.markdown-section p,.markdown-section ul{margin:1.2em 0}.markdown-section ol,.markdown-section p,.markdown-section ul{margin:0 0 1em;line-height:1.5}.markdown-section ol,.markdown-section ul{padding-left:1.5em}.markdown-section li{margin:0;line-height:1.5}.markdown-section blockquote{color:#858585;border-left:4px solid #0074d9;margin:2em 0;padding-left:20px}.markdown-section blockquote p{font-weight:600;margin-left:0}.markdown-section iframe{margin:1em 0}.markdown-section em{color:#7f8c8d}.markdown-section code{padding:.2em .4em;border-radius:3px;white-space:pre}.markdown-section code,.markdown-section pre{background-color:#f9f9f9;font-family:Inconsolata}.markdown-section pre{border-left:2px solid #eee;padding:8px;margin:0 0 1em;padding:12px 10px 12px 12px;font-size:16px}.token.cdata,.token.comment,.token.doctype,.token.prolog{color:#93a1a1}.token.punctuation{color:#586e75}.namespace{opacity:.7}.token.boolean,.token.constant,.token.deleted,.token.number,.token.property,.token.symbol,.token.tag{color:#268bd2}.token.attr-name,.token.builtin,.token.char,.token.inserted,.token.selector,.token.string,.token.url{color:#2aa198}.token.entity{color:#657b83;background:#eee8d5}.token.atrule,.token.attr-value,.token.keyword{color:#a11}.token.function{color:#b58900}.token.important,.token.regex,.token.variable{color:#cb4b16}.token.bold,.token.important{font-weight:700}.token.italic{font-style:italic}.token.entity{cursor:help}.markdown-section pre>code{display:block;font-family:Inconsolata;line-height:1.2em;padding:0}.markdown-section code:after,.markdown-section code:before{letter-spacing:.05em}code .token{min-height:1.5em;-webkit-font-smoothing:initial;-moz-osx-font-smoothing:initial}pre code{overflow-x:auto;position:relative;padding:0;background-color:#f8f8f8;padding:.8em .8em .4em;line-height:1.1em;border-radius:2px}.content img{max-width:100%}.content span.light{color:#7f8c8d}.content span.info{display:inline-block;font-size:.85em;margin-left:20px;vertical-align:middle;width:280px}
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diff --git a/lib/themes/pure.css b/lib/themes/pure.css
new file mode 100644
index 0000000..1b8996d
--- /dev/null
+++ b/lib/themes/pure.css
@@ -0,0 +1 @@
+*{box-sizing:border-box;-webkit-overflow-scrolling:touch;-webkit-tap-highlight-color:rgba(0,0,0,0);-webkit-text-size-adjust:none;-webkit-touch-callout:none;-webkit-font-smoothing:antialiased}nav{position:absolute;right:0;left:0;z-index:2;margin:25px 60px 0 0;text-align:right}nav a{margin:0 1em;padding:5px 0;font-size:16px;text-decoration:none;color:inherit;transition:color .3s}.github-corner{position:absolute;top:0;right:0;z-index:2}.github-corner svg{color:#fff;height:80px;width:80px}.github-corner:hover .octo-arm{animation:a .56s ease-in-out}@keyframes a{0%,to{transform:rotate(0)}20%,60%{transform:rotate(-25deg)}40%,80%{transform:rotate(10deg)}}@media (max-width:500px){.github-corner:hover .octo-arm{animation:none}.github-corner .octo-arm{animation:a .56s ease-in-out}}body,html{height:100%}body{-moz-osx-font-smoothing:grayscale;-webkit-font-smoothing:antialiased;font-family:Source Sans Pro,Helvetica Neue,Arial,sans-serif;font-size:15px;letter-spacing:0;margin:0}main{height:100%;position:relative;width:100%}.sidebar{border-right:1px solid rgba(0,0,0,.07);bottom:0;overflow-y:auto;position:absolute;top:0;width:300px;z-index:1;padding-top:40px}.sidebar ul{margin:0;padding:0}.sidebar ul,.sidebar ul li{list-style:none}.sidebar ul li a{display:block;border-bottom:none}.sidebar ul li ul{padding-left:20px}.content{bottom:0;left:300px;overflow-y:auto;position:absolute;right:0;top:0;overflow-x:hidden;padding-top:20px}@media screen and (max-width:600px){.sidebar{left:-300px}.content{left:0}}.markdown-section{position:relative;margin:0 auto;max-width:800px;padding:20px 15px 40px}.markdown-section *{box-sizing:border-box;-webkit-box-sizing:border-box;font-size:inherit}.markdown-section>:first-child{margin-top:0!important}
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diff --git a/lib/themes/vue.css b/lib/themes/vue.css
new file mode 100644
index 0000000..df3ac2a
--- /dev/null
+++ b/lib/themes/vue.css
@@ -0,0 +1 @@
+@import url('https://fonts.googleapis.com/css?family=Roboto+Mono|Source+Sans+Pro:300,400,600');*{box-sizing:border-box;-webkit-overflow-scrolling:touch;-webkit-tap-highlight-color:rgba(0,0,0,0);-webkit-text-size-adjust:none;-webkit-touch-callout:none;-webkit-font-smoothing:antialiased}nav{position:absolute;right:0;left:0;z-index:2;margin:25px 60px 0 0;text-align:right}nav a{margin:0 1em;padding:5px 0;font-size:16px;text-decoration:none;color:inherit;transition:color .3s}nav a.active,nav a:hover{color:#42b983}nav a.active{border-bottom:2px solid #42b983}.github-corner{position:absolute;top:0;right:0;z-index:2}.github-corner svg{color:#fff;fill:#42b983;height:80px;width:80px}.github-corner:hover .octo-arm{animation:a .56s ease-in-out}@keyframes a{0%,to{transform:rotate(0)}20%,60%{transform:rotate(-25deg)}40%,80%{transform:rotate(10deg)}}@media (max-width:500px){.github-corner:hover .octo-arm{animation:none}.github-corner .octo-arm{animation:a .56s 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