Responsive Landing Page and Menu

Hi there,

How can I make my landing page responsive? WordPress theme – Ascension.

http://www.wildcardtheatre.co.uk

I’ve moved the menu across to centre and increased the font size, plus I’ve added some social media buttons.

The buttons don’t decrease in size when changing devise and the menu goes out of sync. I think what I’d like is for the changes to the menu only to appear on desktop but for it to be as it is in the default theme for devises.

Also on this page:

http://www.wildcardtheatre.com/past-productions/midsummer

I’ve increased the text size of the title but I want it to decrease on other devises. The menu is also out of sync on tablets – I’d like it to go back to default. Is there also a way for the title to appear above the scrolling images on devises?

Any help would be much appreciated!

Best,
James