Return to Shop button and other CSS settings

I am trying to get a consistent colour scheme across my whole site and trying to get the Woocommerce buttons inline with the site itself. I have found the majority of CSS settings in previous threads on this forum, but no luck with the “Return to Shop” button on the cart.

Also the Place Order button has a thick blue line beneath it. Could you possibly give me an idea of how to change these please.

One final question is to do with the Ajax go to checkout prompt that comes up in the bottom left hand corner of the screen when you add to cart via the class= ajax_add_to_cart style buttons on the home page (as per your highend shop demo home page). This go to checkout message set to blue, is there a setting to change this colour too?