Some time WordPress show only white screen or only your background image instead of the site, the simple to understand the error is to enable the debug, it will the show you what went wrong , it could be memory exhausted issue or some add-on when rough after update , Add the following code in your wp-config.php (/var/www/html/”your WordPress location”) file :
error_reporting(E_ALL); ini_set('display_errors', 1);define( 'WP_DEBUG', true);Once you add this, the blank screen will now have errors, warnings, and notices. These may be able to help you determine the root cause.