responsive and alignment center

hi,

thank you for this great plugin!
i ve got two issues:

can i make the popup responsive?
so i can use it for mobile devices?

and when i only want to use the follow button.
how can i align it to center of popup.
in my case its left. it tried every alignment of the code.

thank you!

https://ww.wp.xz.cn/plugins/popups/