add btc donate button

index.html

@@ -77,6 +77,21 @@
     <div class="sharing">
       <a href="https://twitter.com/share" class="twitter-share-button" data-text="Check out 2048, a game where you join numbers to score high! #2048game" data-via="gabrielecirulli">Tweet</a>
       <script>!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0],p=/^http:/.test(d.location)?'http':'https';if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src=p+'://platform.twitter.com/widgets.js';fjs.parentNode.insertBefore(js,fjs);}}(document, 'script', 'twitter-wjs');</script>
+      <script src="http://coinwidget.com/widget/coin.js"></script>
+      <script>
+      CoinWidgetCom.go({
+        wallet_address: "1JoG1ctMSx9PgXdm8bc2XZ5o9BrWiq4vEZ"
+        , currency: "bitcoin"
+        , counter: "count"
+        , alignment: "ac"
+        , qrcode: true
+        , auto_show: false
+        , lbl_button: "Donate"
+        , lbl_address: "My Bitcoin Address:"
+        , lbl_count: "donations"
+        , lbl_amount: "BTC"
+      });
+      </script>
     </div>
   </div>
   <script>

style/main.css

@@ -449,6 +449,9 @@ hr {
 .sharing {
   margin-top: 20px;
   text-align: center; }
+  .sharing > iframe, .sharing span {
+    display: inline-block;
+    vertical-align: middle; }
 
 @media screen and (max-width: 480px) {
   html, body {

style/main.scss

@@ -419,6 +419,11 @@ hr {
 .sharing {
   margin-top: 20px;
   text-align: center;
+
+  > iframe, span {
+    display: inline-block;
+    vertical-align: middle;
+  }
 }
 
 @include smaller(480px) {