Index: wp-admin/custom-background.php
===================================================================
--- wp-admin/custom-background.php	(revision 22439)
+++ wp-admin/custom-background.php	(working copy)
@@ -260,7 +260,7 @@
 		<input type="file" id="upload" name="import" />
 		<input type="hidden" name="action" value="save" />
 		<?php wp_nonce_field( 'custom-background-upload', '_wpnonce-custom-background-upload' ); ?>
-		<?php submit_button( __( 'Upload' ), 'small', 'submit', false ); ?>
+		<?php submit_button( __( 'Upload' ), 'button', 'submit', false ); ?>
 	</p>
 	<?php
 		$image_library_url = get_upload_iframe_src( 'image', null, 'library' );
Index: wp-admin/custom-header.php
===================================================================
--- wp-admin/custom-header.php	(revision 22439)
+++ wp-admin/custom-header.php	(working copy)
@@ -531,7 +531,7 @@
 		<input type="file" id="upload" name="import" />
 		<input type="hidden" name="action" value="save" />
 		<?php wp_nonce_field( 'custom-header-upload', '_wpnonce-custom-header-upload' ); ?>
-		<?php submit_button( __( 'Upload' ), 'small', 'submit', false ); ?>
+		<?php submit_button( __( 'Upload' ), 'button', 'submit', false ); ?>
 	</p>
 	<?php
 		$image_library_url = get_upload_iframe_src( 'image', null, 'library' );
Index: wp-admin/install.php
===================================================================
--- wp-admin/install.php	(revision 22439)
+++ wp-admin/install.php	(working copy)
@@ -136,7 +136,7 @@
 			<td colspan="2"><label><input type="checkbox" name="blog_public" value="1" <?php checked( $blog_public ); ?> /> <?php _e( 'Allow search engines to index this site.' ); ?></label></td>
 		</tr>
 	</table>
-	<p class="step"><input type="submit" name="Submit" value="<?php esc_attr_e( 'Install WordPress' ); ?>" class="button button-large" /></p>
+	<p class="step"><input type="submit" name="Submit" value="<?php esc_attr_e( 'Install WordPress' ); ?>" class="button button-large button-primary" /></p>
 </form>
 <?php
 } // end display_setup_form()
@@ -144,7 +144,7 @@
 // Let's check to make sure WP isn't already installed.
 if ( is_blog_installed() ) {
 	display_header();
-	die( '<h1>' . __( 'Already Installed' ) . '</h1><p>' . __( 'You appear to have already installed WordPress. To reinstall please clear your old database tables first.' ) . '</p><p class="step"><a href="../wp-login.php" class="button button-large">' . __( 'Log In' ) . '</a></p></body></html>' );
+	die( '<h1>' . __( 'Already Installed' ) . '</h1><p>' . __( 'You appear to have already installed WordPress. To reinstall please clear your old database tables first.' ) . '</p><p class="step"><a href="../wp-login.php" class="button button-large button-primary">' . __( 'Log In' ) . '</a></p></body></html>' );
 }
 
 $php_version    = phpversion();
@@ -243,7 +243,7 @@
 	</tr>
 </table>
 
-<p class="step"><a href="../wp-login.php" class="button button-large"><?php _e( 'Log In' ); ?></a></p>
+<p class="step"><a href="../wp-login.php" class="button button-large button-primary"><?php _e( 'Log In' ); ?></a></p>
 
 <?php
 		}