Index: src/wp-admin/css/forms.css
===================================================================
--- src/wp-admin/css/forms.css	(revision 28999)
+++ src/wp-admin/css/forms.css	(working copy)
@@ -751,9 +751,59 @@
 	margin: -3px 3px;
 }
 
+/*------------------------------------------------------------------------------
+  21.0 - Upload File
+------------------------------------------------------------------------------*/
+
+.wp-upload-container {
+	-webkit-box-sizing: border-box;
+	-moz-box-sizing: border-box;
+	box-sizing: border-box;
+	margin: 0px 0 0;
+	padding: 0;
+	width: 100%;
+	overflow: hidden;
+	position: relative;
+	top: 10px;
+}
+.wp-upload-container-hidden {
+	display: none;
+}
+.wp-upload-container .wp-upload-form {
+	background: #fafafa;
+	border: 1px solid #e5e5e5;
+	padding: 30px;
+	margin: 30px auto;
+	max-width: 380px;
+}
+.wp-upload-container .install-help {
+	color: #999;
+	font-size: 18px;
+	font-style: normal;
+	margin: 0;
+	padding: 40px 0 0;
+	text-align: center;
+}
+
+body.show-upload-container .wp-upload-container-hidden {
+	display: block;
+}
+
 /* =Media Queries
 -------------------------------------------------------------- */
 
+@media only screen and (max-width: 1120px) {
+	.wp-upload-container .wp-upload-form {
+		margin: 20px 0;
+		max-width: 100%;
+	}
+	.wp-upload-container .install-help {
+		font-size: 15px;
+		padding: 20px 0 0;
+		text-align: left;
+	}
+}
+
 @media screen and ( max-width: 782px ) {
 	/* Input Elements */
 	textarea {
Index: src/wp-admin/css/themes.css
===================================================================
--- src/wp-admin/css/themes.css	(revision 28999)
+++ src/wp-admin/css/themes.css	(working copy)
@@ -1108,46 +1108,17 @@
 	cursor: pointer;
 }
 .theme-install-php a.browse-themes,
-.theme-install-php.show-upload-theme a.upload {
+.theme-install-php.show-upload-container a.upload {
 	display: none;
 }
-.theme-install-php.show-upload-theme a.browse-themes {
+.theme-install-php.show-upload-container a.browse-themes {
 	display: inline;
 }
-.upload-theme {
-	-webkit-box-sizing: border-box;
-	-moz-box-sizing: border-box;
-	box-sizing: border-box;
+
+body.show-upload-container .wp-upload-container + .theme-navigation,
+body.show-upload-container .wp-upload-container + .theme-navigation + .theme-browser {
 	display: none;
-	margin: 0px 0 0;
-	padding: 0;
-	width: 100%;
-	overflow: hidden;
-	position: relative;
-	top: 10px;
 }
-body.show-upload-theme .upload-theme {
-	display: block;
-}
-.upload-theme .wp-upload-form {
-	background: #fafafa;
-	border: 1px solid #e5e5e5;
-	padding: 30px;
-	margin: 30px auto;
-	max-width: 380px;
-}
-.upload-theme .install-help {
-	color: #999;
-	font-size: 18px;
-	font-style: normal;
-	margin: 0;
-	padding: 40px 0 0;
-	text-align: center;
-}
-body.show-upload-theme .upload-theme + .theme-navigation,
-body.show-upload-theme .upload-theme + .theme-navigation + .theme-browser {
-	display: none;
-}
 .theme-navigation .theme-count {
 	margin-left: 0;
 	position: absolute;
@@ -1340,7 +1311,7 @@
 body.no-results p.no-themes {
 	display: block;
 }
-body.show-upload-theme p.no-themes {
+body.show-upload-container p.no-themes {
 	display: none !important;
 }
 
@@ -1358,15 +1329,6 @@
 	.more-filters-container {
 		border-bottom: 1px solid #eee;
 	}
-	.upload-theme .wp-upload-form {
-		margin: 20px 0;
-		max-width: 100%;
-	}
-	.upload-theme .install-help {
-		font-size: 15px;
-		padding: 20px 0 0;
-		text-align: left;
-	}
 	.more-filters-container .filters-group {
 		margin-bottom: 0;
 		margin-top: 5px;
Index: src/wp-admin/includes/plugin-install.php
===================================================================
--- src/wp-admin/includes/plugin-install.php	(revision 28999)
+++ src/wp-admin/includes/plugin-install.php	(working copy)
@@ -187,14 +187,15 @@
  */
 function install_plugins_upload( $page = 1 ) {
 ?>
-	<h4><?php _e('Install a plugin in .zip format'); ?></h4>
-	<p class="install-help"><?php _e('If you have a plugin in a .zip format, you may install it by uploading it here.'); ?></p>
-	<form method="post" enctype="multipart/form-data" class="wp-upload-form" action="<?php echo self_admin_url('update.php?action=upload-plugin'); ?>">
-		<?php wp_nonce_field( 'plugin-upload'); ?>
-		<label class="screen-reader-text" for="pluginzip"><?php _e('Plugin zip file'); ?></label>
-		<input type="file" id="pluginzip" name="pluginzip" />
-		<?php submit_button( __( 'Install Now' ), 'button', 'install-plugin-submit', false ); ?>
-	</form>
+	<div class="wp-upload-container">
+		<p class="install-help"><?php _e('If you have a plugin in a .zip format, you may install it by uploading it here.'); ?></p>
+		<form method="post" enctype="multipart/form-data" class="wp-upload-form" action="<?php echo self_admin_url('update.php?action=upload-plugin'); ?>">
+			<?php wp_nonce_field( 'plugin-upload'); ?>
+			<label class="screen-reader-text" for="pluginzip"><?php _e('Plugin zip file'); ?></label>
+			<input type="file" id="pluginzip" name="pluginzip" />
+			<?php submit_button( __( 'Install Now' ), 'button', 'install-plugin-submit', false ); ?>
+		</form>
+	</div>
 <?php
 }
 add_action('install_plugins_upload', 'install_plugins_upload', 10, 1);
Index: src/wp-admin/js/theme.js
===================================================================
--- src/wp-admin/js/theme.js	(revision 28999)
+++ src/wp-admin/js/theme.js	(working copy)
@@ -1499,12 +1499,12 @@
 	uploader: function() {
 		$( 'a.upload' ).on( 'click', function( event ) {
 			event.preventDefault();
-			$( 'body' ).addClass( 'show-upload-theme' );
+			$( 'body' ).addClass( 'show-upload-container' );
 			themes.router.navigate( themes.router.baseUrl( '?upload' ), { replace: true } );
 		});
 		$( 'a.browse-themes' ).on( 'click', function( event ) {
 			event.preventDefault();
-			$( 'body' ).removeClass( 'show-upload-theme' );
+			$( 'body' ).removeClass( 'show-upload-container' );
 			themes.router.navigate( themes.router.baseUrl( '' ), { replace: true } );
 		});
 	},
Index: src/wp-admin/theme-install.php
===================================================================
--- src/wp-admin/theme-install.php	(revision 28999)
+++ src/wp-admin/theme-install.php	(working copy)
@@ -114,7 +114,7 @@
 		<a href="#" class="browse-themes add-new-h2"><?php _ex( 'Browse', 'themes' ); ?></a>
 	</h2>
 
-	<div class="upload-theme">
+	<div class="wp-upload-container wp-upload-container-hidden">
 	<?php install_themes_upload(); ?>
 	</div>