Update index.html

grammar Natzi
diff --git a/index.html b/index.html
index 2e962ec..b2e41e5 100644
--- a/index.html
+++ b/index.html
@@ -51,7 +51,7 @@
           <div class="col-xs-12 headline">
             <img class="centered text-center" src="https://i.imgur.com/nzsZTTY.png">
             <h1 class="text-center">This is Bliss OS</h1>
-            <p class="lead text-center">A Open-Source OS, based on Android, for phones, tablets &amp; PC's</p>
+            <p class="lead text-center">An Open-Source OS, based on Android, for phones, tablets &amp; PC's</p>
           </div>
         </div>
         <div class="row">
@@ -583,4 +583,4 @@
   <script src="js/script.js"></script>
 </body>
 
-</html>
\ No newline at end of file
+</html>