configuring a login page as first page when arrives on site

i would like to configure a login page when someone arrives on my site

that mean that when arrive at this url there is a full login page
like the one provided with simpleModal login plugin.
see screen capture joined

if it is possible to do that with membership plugin only and have same features than SimpleModal plugin so how can i configure it

if not how can i configure SimpleModal plugin to do what i need.

I would like that acces to all site is restricted to only registered member with one level of access

Best regards and thanks for answear