Index: src/wp-admin/css/list-tables.css
===================================================================
--- src/wp-admin/css/list-tables.css	(revision 29577)
+++ src/wp-admin/css/list-tables.css	(working copy)
@@ -1347,8 +1347,6 @@
 }
 
 .plugin-icon {
-	width: 128px;
-	height: 128px;
 	float: left;
 	margin: 0 1em 1em 0;
 }
Index: src/wp-admin/includes/class-wp-plugin-install-list-table.php
===================================================================
--- src/wp-admin/includes/class-wp-plugin-install-list-table.php	(revision 29577)
+++ src/wp-admin/includes/class-wp-plugin-install-list-table.php	(working copy)
@@ -420,7 +420,7 @@
 		?>
 		<div class="plugin-card">
 			<div class="plugin-card-top">
-				<a href="<?php echo esc_url( $details_link ); ?>" class="thickbox"><img src="<?php echo esc_attr( $plugin_icon_url ) ?>" class="plugin-icon" /></a>
+				<a href="<?php echo esc_url( $details_link ); ?>" class="thickbox"><img src="<?php echo esc_attr( $plugin_icon_url ) ?>" width="128" height="128" class="plugin-icon" /></a>
 				<div class="action-links">
 					<?php
 						if ( $action_links ) {