new wp-signup.php not fitting with template of theme

okay okay... it's not the WPMU Dixi theme I'm's a ring in from Woo Commerce (please don't shoot me!)

The wp-signup.php is not conforming with the theme when a visitor clicks on the register link on the normal sign in page.... is there something simple I can do / look for to remedy this?

Is there a shortcode or similar a can use to tie a register page in with the look of the site?