Centered the button

templates/index.html

@@ -19,7 +19,7 @@
       </div>
       <div class="column" style="background-color:#ddd">
         <p style="font-size:25px; text-align:center;">Trigger the garage door opener.</p>
-        <a class="active" href="/open-garage" style="text-align:center;">{{ OpenOrClose }}</a>
+        <a class="active" href="/open-garage" style="margin:0 auto; display:block;">{{ OpenOrClose }}</a>
       </div>
     </div>
     <div class="header">