Profile / login styles

And please related to the question above, how to edit that same form appearance?
i tried my best with my theme and page composer, but it keeps on appearing on a side, like there is huge differance between the right space and the left space, the form is not centered

when i asked the theme programmer he said it doesnt streach it feilds to fill the surreonding “dIV” not sure what does that mean but can i solve this problem? i just need it like the WP registration page looks like, and login too.

http://imgur.com/X4XnmLo this is the screen shot of the page i created

thanks a lot