fix style flaws in changelog.
diff --git a/en/changelog.html b/en/changelog.html
index e82a5b9..5726f8b 100644
--- a/en/changelog.html
+++ b/en/changelog.html
@@ -9,14 +9,16 @@
</script><title>Changelog - Apache ECharts</title><script type="text/javascript" src="https://cdn.jsdelivr.net/npm/jquery@2.2.4/dist/jquery.min.js"></script></head><!--[if lte IE 8]><body class="lower-ie"><div id="lowie-main"><img src="https://echarts.apache.org/en/images/forie.png?_v_=20200710_1" alt="ie tip"></div></body><![endif]-->
<!--[if (gt IE 8)|!(IE)]><body class="undefined"></body><![endif]--><div id="apache-banner"><div class="txt"><p>Please visit the official Apache ECharts Website at</p><a id="a2" href="https://echarts.apache.org/zh/index.html">https://echarts.apache.org</a></div><a href="https://echarts.apache.org" target="_blank" onclick="logApache()" class="btn btn-main"><div>Visit Official Website</div></a><a href="javascript:;" onclick="closeApacheBanner(true)" class="close-btn">x</a></div><div id="main"><nav class="navbar navbar-default navbar-fixed-top"><nav role="navigation" class="navbar navbar-default navbar-fixed-top"><div class="container-fluid"><div class="navbar-header"><button type="button" data-toggle="collapse" data-target="#navbar-collapse" aria-expanded="false" class="navbar-toggle collapsed"><span class="sr-only">Toggle navigation</span><span class="icon-bar"></span><span class="icon-bar"></span><span class="icon-bar"></span></button><a href="https://echarts.apache.org/en/index.html" 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d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg></a></li><li><a href="https://github.com/apache/echarts/issues" target="_blank">Issues (GitHub)<svg width="15px" height="15px" viewbox="0 0 100 100" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" class="icon-external-link"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg></a></li></ul></li><li id="nav-others"><a href="#" data-toggle="dropdown" class="dropdown-toggle">ASF<b class="caret"></b></a><ul class="dropdown-menu"><li><a 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d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg></a></li><li><a href="https://www.apache.org/events/current-event" target="_blank">Events<svg width="15px" height="15px" viewbox="0 0 100 100" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" class="icon-external-link"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg></a></li><li><a href="https://www.apache.org/foundation/sponsorship.html" target="_blank">Sponsorship<svg width="15px" height="15px" viewbox="0 0 100 100" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" class="icon-external-link"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg></a></li><li><a href="https://www.apache.org/foundation/thanks.html" target="_blank">Thanks<svg width="15px" height="15px" viewbox="0 0 100 100" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" class="icon-external-link"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg></a></li></ul></li></ul><ul class="nav navbar-nav navbar-right"><li id="nav-homeen"><a href="javascript:;" onclick="changeLang('zh')">中文</a></li></ul></div></div></nav></nav><div class="page-main"><div class="page-info"><h1>Changelog</h1><p>[+]Add [-]Remove [^]Update [#]Fix</p><p class="page-info-echarts">Apache ECharts<sup>TM</sup></p></div><div class="page-content single-page"><div class="page-nav"><a class="slide-btn">Collapse</a><h4>Versions</h4><ul></ul></div><div class="page-detail changelog"><h2 id="v5-1-1">v5.1.1</h2>
<div class="time">2021-04-27</div>
-+ [Fix] [geo] Fix tooltip don't show on <code>geo</code> component. <a href="https://github.com/apache/echarts/issues/14767">#14767</a> (<a href="https://github.com/pissang">pissang</a>)
-+ [Fix] [tooltip] Fix the position of tooltip may be incorrect when <code>appendToBody</code>. <a href="https://github.com/apache/echarts/issues/14713">#14713</a> (<a href="https://github.com/plainheart">plainheart</a>)
-+ [Fix] [map] Fix tooltip may have error on map series. <a href="https://github.com/apache/echarts/issues/14704">#14704</a> (<a href="https://github.com/plainheart">plainheart</a>)
-+ [Fix] [pie] Fix labelLine may still appear on emphasis when changed from outside to inside. <a href="https://github.com/apache/echarts/issues/14702">#14702</a> (<a href="https://github.com/villebro">villebro</a>)
-+ [Fix] [type] Fix type error on earlier TypeScript versions. Close <a href="https://github.com/apache/echarts/issues/14716">#14716</a> <a href="https://github.com/apache/echarts/issues/14739">#14739</a>
-+ [Fix] [type] <code>symbolOffset</code> incorrectly marked as optional. <a href="https://github.com/apache/echarts/pull/14693">#14693</a> (<a href="https://github.com/villebro">villebro</a>)
-## v5.1.0
+<ul>
+<li>[Fix] [geo] Fix tooltip don't show on <code>geo</code> component. <a href="https://github.com/apache/echarts/issues/14767">#14767</a> (<a href="https://github.com/pissang">pissang</a>)</li>
+<li>[Fix] [tooltip] Fix the position of tooltip may be incorrect when <code>appendToBody</code>. <a href="https://github.com/apache/echarts/issues/14713">#14713</a> (<a href="https://github.com/plainheart">plainheart</a>)</li>
+<li>[Fix] [map] Fix tooltip may have error on map series. <a href="https://github.com/apache/echarts/issues/14704">#14704</a> (<a href="https://github.com/plainheart">plainheart</a>)</li>
+<li>[Fix] [pie] Fix labelLine may still appear on emphasis when changed from outside to inside. <a href="https://github.com/apache/echarts/issues/14702">#14702</a> (<a href="https://github.com/villebro">villebro</a>)</li>
+<li>[Fix] [type] Fix type error on earlier TypeScript versions. Close <a href="https://github.com/apache/echarts/issues/14716">#14716</a> <a href="https://github.com/apache/echarts/issues/14739">#14739</a></li>
+<li>[Fix] [type] <code>symbolOffset</code> incorrectly marked as mandatory. <a href="https://github.com/apache/echarts/pull/14693">#14693</a> (<a href="https://github.com/villebro">villebro</a>)</li>
+</ul>
+<h2 id="v5-1-0">v5.1.0</h2>
<div class="time">2021-04-15</div>
<ul>
diff --git a/zh/changelog.html b/zh/changelog.html
index 05d4d9f..468b440 100644
--- a/zh/changelog.html
+++ b/zh/changelog.html
@@ -9,14 +9,16 @@
</script><title>版本记录 - Apache ECharts</title><script type="text/javascript" src="https://cdn.jsdelivr.net/npm/jquery@2.2.4/dist/jquery.min.js"></script></head><!--[if lte IE 8]><body class="lower-ie"><div id="lowie-main"><img src="https://cdn.jsdelivr.net/gh/apache/echarts-website@asf-site/zh/images/forie.png?_v_=20200710_1" alt="ie tip"></div></body><![endif]-->
<!--[if (gt IE 8)|!(IE)]><body class="undefined"></body><![endif]--><div id="apache-banner"><div class="txt"><p>请访问 Apache ECharts 的官网 </p><a id="a1" href="https://echarts.apache.org/zh/index.html">https://echarts.apache.org</a></div><a href="https://echarts.apache.org" target="_blank" onclick="logApache()" class="btn btn-main"><div>访问官网</div></a><a href="javascript:;" onclick="closeApacheBanner(true)" class="close-btn">x</a></div><div id="main"><nav role="navigation" class="navbar navbar-default navbar-fixed-top"><div class="container-fluid"><div class="navbar-header"><button type="button" data-toggle="collapse" data-target="#navbar-collapse" aria-expanded="false" class="navbar-toggle collapsed"><span class="sr-only">Toggle navigation</span><span class="icon-bar"></span><span class="icon-bar"></span><span class="icon-bar"></span></button><a href="https://echarts.apache.org/zh/index.html" class="navbar-brand"><img 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href="#" data-toggle="dropdown" class="dropdown-toggle">社区<b class="caret"></b></a><ul class="dropdown-menu"><li><a href="https://echarts.apache.org/zh/events.html">活动</a></li><li><a href="https://echarts.apache.org/zh/committers.html">贡献者列表</a></li><li><a href="https://echarts.apache.org/zh/maillist.html">邮件列表</a></li><li><a href="https://echarts.apache.org/zh/contributing.html">如何贡献</a></li><li><a href="https://echarts.apache.org/zh/dependencies.html">依赖项</a></li><li><a href="https://echarts.apache.org/zh/coding-standard.html">代码规范</a></li><li><a href="https://github.com/apache/echarts" target="_blank">源码（GitHub）<svg width="15px" height="15px" viewbox="0 0 100 100" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" class="icon-external-link"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 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xmlns:xlink="http://www.w3.org/1999/xlink" class="icon-external-link"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg></a></li><li><a href="https://echarts.apache.org/zh/security.html">安全</a></li><li><a href="https://www.apache.org/licenses/" target="_blank">版权<svg width="15px" height="15px" viewbox="0 0 100 100" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" class="icon-external-link"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg></a></li><li><a href="https://www.apache.org/events/current-event" target="_blank">活动<svg width="15px" height="15px" viewbox="0 0 100 100" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" class="icon-external-link"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg></a></li><li><a href="https://www.apache.org/foundation/sponsorship.html" target="_blank">捐赠<svg width="15px" height="15px" viewbox="0 0 100 100" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" class="icon-external-link"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg></a></li><li><a href="https://www.apache.org/foundation/thanks.html" target="_blank">鸣谢<svg width="15px" height="15px" viewbox="0 0 100 100" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" class="icon-external-link"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg></a></li></ul></li></ul><ul class="nav navbar-nav navbar-right"><li id="nav-homeen"><a href="javascript:;" onclick="changeLang('en')">EN</a></li></ul></div></div></nav><div class="page-main"><div class="page-info"><h1>版本记录</h1><p class="page-info-echarts">Apache ECharts<sup>TM</sup></p></div><div class="page-content single-page"><div class="page-nav"><a class="slide-btn">收起目录</a><h4>版本记录</h4><ul></ul></div><div class="page-detail"><h2 id="v5-1-1">v5.1.1</h2>
<div class="time">2021-04-27</div>
-+ [Fix] [geo] 修复 5.1.0 引入的<code>geo</code>组件上<code>tooltip</code>无法显示的问题。 <a href="https://github.com/apache/echarts/issues/14767">#14767</a> (<a href="https://github.com/pissang">pissang</a>)
-+ [Fix] [tooltip] 修复 5.1.0 引入的 tooltip 在开启 <code>appendToBody</code> 后位置不对的问题。 <a href="https://github.com/apache/echarts/issues/14713">#14713</a> (<a href="https://github.com/plainheart">plainheart</a>)
-+ [Fix] [map] 修复 5.1.0 引入的地图上的<code>tooltip</code>可能会报错的问题。 <a href="https://github.com/apache/echarts/issues/14704">#14704</a> (<a href="https://github.com/plainheart">plainheart</a>)
-+ [Fix] [pie] 修复饼图上标签引导线<code>labelLine</code>从<code>outside</code>修改为<code>inside</code>之后高亮依然可能显示的问题。 <a href="https://github.com/apache/echarts/issues/14702">#14702</a> (<a href="https://github.com/villebro">villebro</a>)
-+ [Fix] [type] 修复 5.1.0 引入的老版本 TypeScript 可能出现类型错误的问题。 Close <a href="https://github.com/apache/echarts/issues/14716">#14716</a> <a href="https://github.com/apache/echarts/issues/14739">#14739</a>
-+ [Fix] [type] 修复 <code>symbolOffset</code> 非可选的类型错误。 <a href="https://github.com/apache/echarts/pull/14693">#14693</a> (<a href="https://github.com/villebro">villebro</a>)
-## v5.1.0
+<ul>
+<li>[Fix] [geo] 修复 5.1.0 引入的<code>geo</code>组件上<code>tooltip</code>无法显示的问题。 <a href="https://github.com/apache/echarts/issues/14767">#14767</a> (<a href="https://github.com/pissang">pissang</a>)</li>
+<li>[Fix] [tooltip] 修复 5.1.0 引入的 tooltip 在开启 <code>appendToBody</code> 后位置不对的问题。 <a href="https://github.com/apache/echarts/issues/14713">#14713</a> (<a href="https://github.com/plainheart">plainheart</a>)</li>
+<li>[Fix] [map] 修复 5.1.0 引入的地图上的<code>tooltip</code>可能会报错的问题。 <a href="https://github.com/apache/echarts/issues/14704">#14704</a> (<a href="https://github.com/plainheart">plainheart</a>)</li>
+<li>[Fix] [pie] 修复饼图上标签引导线<code>labelLine</code>从<code>outside</code>修改为<code>inside</code>之后高亮依然可能显示的问题。 <a href="https://github.com/apache/echarts/issues/14702">#14702</a> (<a href="https://github.com/villebro">villebro</a>)</li>
+<li>[Fix] [type] 修复 5.1.0 引入的老版本 TypeScript 可能出现类型错误的问题。 Close <a href="https://github.com/apache/echarts/issues/14716">#14716</a> <a href="https://github.com/apache/echarts/issues/14739">#14739</a></li>
+<li>[Fix] [type] 修复 <code>symbolOffset</code> 非可选的类型错误。 <a href="https://github.com/apache/echarts/pull/14693">#14693</a> (<a href="https://github.com/villebro">villebro</a>)</li>
+</ul>
+<h2 id="v5-1-0">v5.1.0</h2>
<div class="time">2021-04-15</div>
<ul>
