How can I customize the login page for a client portal? 

I have the client portal for zoho projects set up as a subdomain on my website. As of now, when a clients see the zoho projects sign in page. Nothing about the login page lets the clients know they are about to sign in to my projects page. There has to be a way to customize this similar to how zoho creator has it set up.

Also, is it not possible to make my clients have to relogin every time they access the portal? 

Any feedback would be great.