diff --git a/website/themes/moderncpp/layout/partials/header.ejs b/website/themes/moderncpp/layout/partials/header.ejs
index b896c10..2f742d3 100755
--- a/website/themes/moderncpp/layout/partials/header.ejs
+++ b/website/themes/moderncpp/layout/partials/header.ejs
@@ -2,10 +2,10 @@
   <a id="logo" href="<%- url_for("/modern-cpp/") %>">
     <% if (page.type == 'book-en-us') { %>
       <img src="<%- url_for("/modern-cpp/assets/cover-2nd-en.png") %>">
-      <span>C++ 11/14/17/20 On the Fly</span><sup class="beta">beta</sup>
+      <span>C++ 11/14/17/20 On the Fly</span>
     <% } else {%>
       <img src="<%- url_for("/modern-cpp/assets/cover-2nd.png") %>">
-      <span>高速上手 C++ 11/14/17/20</span><sup class="beta">beta</sup>
+      <span>高速上手 C++ 11/14/17/20</span>
     <% } %>
   </a>
   <ul id="nav">
diff --git a/website/themes/moderncpp/source/modern-cpp/css/_common.styl b/website/themes/moderncpp/source/modern-cpp/css/_common.styl
index 27dafbb..3cfa089 100755
--- a/website/themes/moderncpp/source/modern-cpp/css/_common.styl
+++ b/website/themes/moderncpp/source/modern-cpp/css/_common.styl
@@ -180,9 +180,3 @@ a.button:hover
     border-left: 4px solid transparent
     border-right: 4px solid transparent
     border-top: 5px solid #fff
-
-sup.beta.beta
-  font-size: .6em
-  margin-left: .7em
-  text-transform: uppercase
-  opacity: .6
diff --git a/website/themes/moderncpp/source/modern-cpp/css/index.styl b/website/themes/moderncpp/source/modern-cpp/css/index.styl
index 5e61b0c..f9afb1c 100755
--- a/website/themes/moderncpp/source/modern-cpp/css/index.styl
+++ b/website/themes/moderncpp/source/modern-cpp/css/index.styl
@@ -13,13 +13,6 @@ body
   img
     display: none
 
-.beta
-  font-size: 12px;
-  color: #F7BA2F;
-  font-family: Roboto, sans-serif;
-  font-weight: bold;
-  font-style: oblique;
-
 .sidebar
   display: none
 
diff --git a/website/themes/moderncpp/source/modern-cpp/css/page.styl b/website/themes/moderncpp/source/modern-cpp/css/page.styl
index ed00eb6..7f79f8c 100755
--- a/website/themes/moderncpp/source/modern-cpp/css/page.styl
+++ b/website/themes/moderncpp/source/modern-cpp/css/page.styl
@@ -7,13 +7,6 @@
   box-shadow: 0 0 1px rgba(0,0,0,.25)
   transition: background-color .3s ease-in-out
 
-.beta
-  font-size: 12px;
-  color: #F7BA2F;
-  font-family: Roboto, sans-serif;
-  font-weight: bold;
-  font-style: oblique;
-
 .image-caption
   display: table;
   margin: 0 auto;