Fix GitHub button size

front/src/main.html

@@ -33,7 +33,7 @@
     <div class="footer">
         <span class="version">@@version</span>
         <br><a href="<%= baseUrl %>about">More about Yellow Lab Tools</a><br>
-        <div class="github"><iframe id="ghbtn" frameborder="0" scrolling="0" width="145px" height="30px"></iframe></div>
+        <div class="github"><iframe id="ghbtn" frameborder="0" scrolling="0" width="160px" height="30px"></iframe></div>
     </div>
 
     <!-- build:js js/all.js -->