You can use CSS positioning to overlap div elements. Set the position property to "absolute" or "relative" and adjust the top, right, bottom, or left properties accordingly. Experiment with these values to achieve the desired overlap effect.
To redirect additional domain names to a clients main domain:
Point the domain name to the custom name servers...
Add the additional domain name to the original domain with cPanel...
Verify with intoDNS...
Run autoSSL with cPanel.