Index: sites/trunk/wordcamp.org/public_html/wp-content/themes/wordcamp-central-2012/functions.php
===================================================================
--- sites/trunk/wordcamp.org/public_html/wp-content/themes/wordcamp-central-2012/functions.php	(revision 2989)
+++ sites/trunk/wordcamp.org/public_html/wp-content/themes/wordcamp-central-2012/functions.php	(working copy)
@@ -56,7 +56,7 @@

 		// Add some new image sizes, also site shot is 205x148, minimap is 130x70
 		add_image_size( 'wccentral-thumbnail-small', 82, 37, true );
-		add_image_size( 'wccentral-thumbnail-large', 926, 160, true );
+		add_image_size( 'wccentral-thumbnail-large', 1852, 320, true );
 		add_image_size( 'wccentral-thumbnail-past', 130, 60, true );
 		add_image_size( 'wccentral-thumbnail-hero', 493, 315, true );

Index: sites/trunk/wordcamp.org/public_html/wp-content/themes/wordcamp-central-2012/style.css
===================================================================
--- sites/trunk/wordcamp.org/public_html/wp-content/themes/wordcamp-central-2012/style.css	(revision 2989)
+++ sites/trunk/wordcamp.org/public_html/wp-content/themes/wordcamp-central-2012/style.css	(working copy)
@@ -1772,9 +1772,11 @@
 .single-wordcamp .wc-banner img {
 	border: 0;
 	vertical-align: middle;
-
+	width: 100%;
+	height: auto;
+
 	box-shadow: none;
-	-webkit-box-shadow: none;
+	-webkit-box-shadow: none;
 }