Image not found replacement

location ~* (jpe?g|png|gif) {
        log_not_found off;
        error_page 404 /content/images/system/default/404.gif;
}

# CORS header (avoids font rendering issues)
location ~ \.(ttf|ttc|otf|eot|woff|woff2|font.css|css|js)$ {
        add_header Access-Control-Allow-Origin "*";
}

# Pretty URLs
location / {
        try_files $uri $uri/ /index.php?$query_string;
}