Please add following text into nginx configuration file.
location / {
# This is cool because no php is touched for static content.
# include the "?$args" part so non-default permalinks doesn't break when using query string
try_files $uri $uri/ /index.php?$is_args$args =404;
}
if (!-e $request_filename) {
rewrite ^.*$ /index.php last;
}