Adjust main block vertical positioning between top of page and beginning of background

[sttic]

It can looked crammed at times. Ideally the main block should have enough space above and below it. There's even less space after entering an email address and the message pops up.

It would need some playing around since we don't want the main block too high, especially on high res vertical devices like tablets, leaving a ton of blank space between it and the background below.