banned.html: center image

templates/banned.html

@@ -1,7 +1,7 @@
 {% filter remove_whitespace %}
 {# Automatically removes unnecessary whitespace #}
 <div class="ban">
-	<img width="420" height="600" src="static/banned.jpg" alt="Purge list: you">
+	<img style="display:block;margin-left:auto;margin-right:auto;" width="420" height="600" src="static/banned.jpg" alt="Purge list: you">
 	{% if ban.expires and time() >= ban.expires %}
 		<h2>{% trans %}You were banned! ;_;{% endtrans %}</h2>
 	{% else %}