Wppa Slideshow Fullscreen

Hi there,
after hours of frustration with the NextGen Gallery i found the great plugin WPPA. I´ve tried to change some css myself but one thing i can´t fix. I wanted to have a Slideshow, that is fullscreen.
Maybe the plugin can Display photos Fullscreen? I dont know how to make the Slideshow “fullscreen” an fit into different resolutions.
Is there a possibility to % instead of px?

I wanted to solve this problem fast, because i have thousands of photos i want to upload but i need this feature urgently.

Thanks for replying and sorry for my bad englisch 😀
Greetings