Index: wp-admin/custom-header.php
===================================================================
--- wp-admin/custom-header.php	(revision 13558)
+++ wp-admin/custom-header.php	(working copy)
@@ -404,10 +404,9 @@
 endif;
 ?>
 <div class="wrap">
-<h2><?php _e('Upload New Header Image'); ?></h2><p><?php _e('Here you can upload a custom header image to be shown at the top of your blog instead of the default one. On the next screen you will be able to crop the image.'); ?></p>
-<p><?php printf(__('Images of exactly <strong>%1$d x %2$d pixels</strong> will be used as-is.'), HEADER_IMAGE_WIDTH, HEADER_IMAGE_HEIGHT); ?></p>
+<h2><?php _e('Upload New Header Image'); ?></h2><p><?php _e('Here you can upload a custom header image to be shown at the top of your blog instead of the default one. On the next screen you will be able to crop the image.'); ?> <?php printf(__('Images of exactly <strong>%1$d x %2$d pixels</strong> will be used as-is.'), HEADER_IMAGE_WIDTH, HEADER_IMAGE_HEIGHT); ?></p>
 
-<form enctype="multipart/form-data" id="uploadForm" method="POST" action="<?php echo esc_attr(add_query_arg('step', 2)) ?>" style="margin: auto; width: 50%;">
+<form enctype="multipart/form-data" id="uploadForm" method="POST" action="<?php echo esc_attr(add_query_arg('step', 2)) ?>">
 <label for="upload"><?php _e('Choose an image from your computer:'); ?></label><br /><input type="file" id="upload" name="import" />
 <input type="hidden" name="action" value="save" />
 <?php wp_nonce_field('custom-header') ?>
Index: wp-admin/css/wp-admin.dev.css
===================================================================
--- wp-admin/css/wp-admin.dev.css	(revision 13558)
+++ wp-admin/css/wp-admin.dev.css	(working copy)
@@ -3668,6 +3668,18 @@
 	display: inline;
 }
 
+/* Custom Header */
+
+table#available-headers td {
+	padding: 0 20px 10px 0;
+}
+table#available-headers label input {
+	margin-right: 8px;
+}
+table#available-headers label img {
+	vertical-align: middle;
+}
+
 /* Tab Interface */
 
 .menu-tabs {