Customizing css in wp construction mode / mailchimp intergration

Hello,

I am trying to customise my WP construction mode ‘coming soon’ page plugin via style.css file, but whatever I try I can’t edit the following:

I am trying to lower the ‘sign up’ box, sign up button and social media icons nearer the bottom of the page. I had achieved this in style.css but didn’t remained centred when I expand or shorten the size of the window.

Id also like to get rid of the circlular border (black background) behind the social icons and make the icons themselves bigger and space them out how I wish.

And lastly mailchimp integration is not working, I have synced my mail chimp account in the mailchimp for wp plugin and generated a shortcode which I then copy and pasted in my Newsletter / Contact Form Shortcode in the WP construction mode plugin. But whenever anyone tries to sign up no via my site, an error comes up saying ‘Please fill in the required fields.’ and nobody gets subscribed to my mailing list or receives any of my emails.

Thank you for any help advance! 🙂

Best,
Andreas Libreos