Fix mobile navbar bug!

Change-Id: I769672f2fa6a69d65ea478dc0210ede296becdca
diff --git a/index.html b/index.html
index 7e1bb9f..0a10d49 100644
--- a/index.html
+++ b/index.html
@@ -38,7 +38,7 @@
       <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse"
         data-target="#navbar2SupportedContent" aria-controls="navbar2SupportedContent" aria-expanded="true"
         aria-label="Toggle navigation"> <span class="navbar-toggler-icon"></span> </button>
-      <div class="navbar-collapse text-center justify-content-end collapse show" id="navbar2SupportedContent">
+      <div class="navbar-collapse text-center justify-content-end collapse" id="navbar2SupportedContent">
         <ul class="navbar-nav">
           <li class="nav-item mx-2">
             <a class="nav-link" href="#features"><b><b>Features</b></b></a>