diff --git a/lib/config.js b/lib/config.js
index 0aa154b..76b21f0 100644
--- a/lib/config.js
+++ b/lib/config.js
@@ -17,7 +17,7 @@ var protocolusessl = (usessl === true && typeof process.env.HMD_PROTOCOL_USESSL
      ? true : (process.env.HMD_PROTOCOL_USESSL ? (process.env.HMD_PROTOCOL_USESSL === 'true') : !!config.protocolusessl);
 var urladdport = process.env.HMD_URL_ADDPORT ? (process.env.HMD_URL_ADDPORT === 'true') : !!config.urladdport;
 
-var usecdn = process.env.HMD_USECDN ? (process.env.HMD_USECDN === 'true') : !!!config.usecdn;
+var usecdn = process.env.HMD_USECDN ? (process.env.HMD_USECDN === 'true') : ((typeof config.usecdn === 'boolean') ? config.usecdn : true);
 
 // db
 var db = config.db || {
diff --git a/public/views/foot.ejs b/public/views/foot.ejs
index 863cae3..8990bda 100644
--- a/public/views/foot.ejs
+++ b/public/views/foot.ejs
@@ -9,6 +9,7 @@
 <script type="text/javascript" src="//cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML" defer></script>
 <script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.15.1/moment-with-locales.min.js" integrity="sha256-J5wam9fTysK5BqYlUUBjbomFslRxkLgwB9AhnVWsj1Q=" crossorigin="anonymous" defer></script>
 <script src="https://cdnjs.cloudflare.com/ajax/libs/mermaid/6.0.0/mermaid.min.js" integrity="sha256-Yabf6Mj1TPKd6h4F6z5xRR1/2son0Wg8NhvjYnhcQcY=" crossorigin="anonymous" defer></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/emojify.js/1.1.0/js/emojify.min.js" integrity="sha256-VAB5tAlKBvgaxw8oJ1crWMVbdmBVl4mP/2M8MNRl+4E=" crossorigin="anonymous" defer></script>
 <% } else { %>
 <script src="<%- url %>/vendor/spin.js/spin.min.js" defer></script>
 <script src="<%- url %>/vendor/velocity/velocity.min.js" defer></script>
diff --git a/public/views/pretty.ejs b/public/views/pretty.ejs
index a2123fb..1f171d1 100644
--- a/public/views/pretty.ejs
+++ b/public/views/pretty.ejs
@@ -93,6 +93,7 @@
 <script type="text/javascript" src="//cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML" defer></script>
 <script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.15.1/moment-with-locales.min.js" integrity="sha256-J5wam9fTysK5BqYlUUBjbomFslRxkLgwB9AhnVWsj1Q=" crossorigin="anonymous" defer></script>
 <script src="https://cdnjs.cloudflare.com/ajax/libs/mermaid/6.0.0/mermaid.min.js" integrity="sha256-Yabf6Mj1TPKd6h4F6z5xRR1/2son0Wg8NhvjYnhcQcY=" crossorigin="anonymous" defer></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/emojify.js/1.1.0/js/emojify.min.js" integrity="sha256-VAB5tAlKBvgaxw8oJ1crWMVbdmBVl4mP/2M8MNRl+4E=" crossorigin="anonymous" defer></script>
 <% } else { %>
 <script src="<%- url %>/vendor/js-yaml/dist/js-yaml.min.js" defer></script>
 <script type="text/javascript" src="<%- url %>/vendor/MathJax/MathJax.js?config=TeX-AMS-MML_HTMLorMML" defer></script>
diff --git a/public/views/slide.ejs b/public/views/slide.ejs
index e401fa4..73f5d71 100644
--- a/public/views/slide.ejs
+++ b/public/views/slide.ejs
@@ -87,11 +87,14 @@
             MathJax.Hub.Config({ messageStyle: "none", skipStartupTypeset: true ,tex2jax: {inlineMath: [['$','$'], ['\\(','\\)']], processEscapes: true }});
         </script>
         <% if(useCDN) { %>
+        <script src="https://cdnjs.cloudflare.com/ajax/libs/reveal.js/3.3.0/lib/js/head.min.js" integrity="sha256-+09kLhwACKXFPDvqo4xMMvi4+uXFsRZ2uYGbeN1U8sI=" crossorigin="anonymous"></script>
+        <script src="https://cdnjs.cloudflare.com/ajax/libs/reveal.js/3.3.0/js/reveal.min.js" integrity="sha256-lvaInSKflJWLPqf5N5oHr/UZFwXKD6gckerdwoHqECY=" crossorigin="anonymous"></script>
         <script src="https://cdnjs.cloudflare.com/ajax/libs/velocity/1.3.1/velocity.min.js" integrity="sha256-zt0EvRuKYSkXKgIFLrJIYeZsBjIZLel9UThCm5GI6io=" crossorigin="anonymous" defer></script>
         <script src="https://cdnjs.cloudflare.com/ajax/libs/js-yaml/3.6.1/js-yaml.min.js" integrity="sha256-tvANaUGcQTLkCS9wHnLZhBFVfIWQJpm98WOpykjD+eo=" crossorigin="anonymous" defer></script>
         <script type="text/javascript" src="//cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML" defer></script>
         <script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.15.1/moment-with-locales.min.js" integrity="sha256-J5wam9fTysK5BqYlUUBjbomFslRxkLgwB9AhnVWsj1Q=" crossorigin="anonymous" defer></script>
         <script src="https://cdnjs.cloudflare.com/ajax/libs/mermaid/6.0.0/mermaid.min.js" integrity="sha256-Yabf6Mj1TPKd6h4F6z5xRR1/2son0Wg8NhvjYnhcQcY=" crossorigin="anonymous" defer></script>
+        <script src="https://cdnjs.cloudflare.com/ajax/libs/emojify.js/1.1.0/js/emojify.min.js" integrity="sha256-VAB5tAlKBvgaxw8oJ1crWMVbdmBVl4mP/2M8MNRl+4E=" crossorigin="anonymous" defer></script>
         <% } else { %>
         <script src="<%- url %>/vendor/reveal.js/lib/js/head.min.js"></script>
         <script src="<%- url %>/vendor/reveal.js/js/reveal.js"></script>