Further update, inc align horizontal and vertical

Hope this looks better

Author: thomas-booker

Diff for: oshc/main/templates/contest_submission.html

@@ -3,7 +3,8 @@
 {% block content %}
 
 <div class="jumbotron text-xs-center">
-  <div class="container text-center">
+  <div class="container text-center" style="position: absolute; margin: auto; top: 0; right: 0;
+  bottom: 15%; left: 0; width: 350px; height: 80px; text-align: center;">
       <h1 class="display-3">Thank You!</h1>
       <p class="lead"><strong>Your contest has been submitted for review.</strong></p>
       <hr>