So lets say that I have a site (wordpress installation)hosted at site.hoster.com and a Domain that I purchased that is example.com How can I redirect the user from example.com to site.hoster.com without changing the URL. I have a added a CNAME Record but the site's url is changing when i try to enter example.com. I have tried a bunch of solutions found here on stackoverflow but I can't get it to work. The site is an apache virtual host. I have added ServerAlias in configuration of the Apache virtual host but it does not work. Here is the .htaccess file of the site `

# BEGIN WordPress
# The directives (lines) between `BEGIN WordPress` and `END WordPress` are
# dynamically generated, and should only be modified via WordPress filters.
# Any changes to the directives between these markers will be overwritten.
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]


</IfModule>

# END WordPress

# BEGIN ShortPixelWebp
# The directives (lines) between `BEGIN ShortPixelWebp` and `END ShortPixelWebp` are
# dynamically generated, and should only be modified via WordPress filters.
# Any changes to the directives between these markers will be overwritten.

# END ShortPixelWebp

PS : I have tried the .htaccess 301 redirect method with varius implementations but it still does not work.

EDIT: Forgot to mention that there is an A record pointing to www CNAME record which point site.hoster.com

Thanks in advance.