nginx Blank Page problem index.php

try to read the error first

tail -f /var/log/nginx/error.log

it is giving no error lets get a look access.log

tail -f /var/log/nginx/access.log

[25/Sep/2019:15:35:53 +0300] “GET /index.php HTTP/1.1” 200 31 “-” “Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:69.0) Gecko/20100101 Firefox/69.0”

it is working correctly

What is writing in my index.php

root@asus:/var/www/html# cat index.php
<?php
phpinfo();
?>

nano /etc/nginx/sites-enabled/default

server {
listen 80 default_server;
listen [::]:80 default_server;

# SSL configuration
#
# listen 443 ssl default_server;
# listen [::]:443 ssl default_server;
#
# Note: You should disable gzip for SSL traffic.
# See: https://bugs.debian.org/773332
#
# Read up on ssl_ciphers to ensure a secure configuration.
# See: https://bugs.debian.org/765782
#
# Self signed certs generated by the ssl-cert package
# Don’t use them in a production server!
#
# include snippets/snakeoil.conf;

root /var/www/html;
# Add index.php to the list if you are using PHP
index index.php index.html index.htm index.nginx-debian.html;
server_name _;
location / {
try_files $uri $uri/ =404;
}
location ~ \.php$ {
include snippets/fastcgi-php.conf;
fastcgi_pass unix:/var/run/php/php7.2-fpm.sock;
}
}

sudo service nginx restart