How to change user login and reistration pages to look the same as my theme

I have the same issue, but with making posts. The problem is that these pages reside in the WP-Admin area, which has its own CSS.

I may have to resort to hiring a PHP designer to make my own page. My efforts to do this myself have failed.

It is just a case of changing the style sheet in admin. Its pretty easy to do. You can also change the graphic from WordPress to your own for your own purposes of theme continuity.

You can easily edit the wp-admin.css file (look in the wp-admin folder) and even the wp-register.php, wp-login.php and various other pages used in the admin app. But be careful. Back up the file BEFORE you modify it so you can replace it if you screw up.

Helpful hint: test your pages using Firefox and get the Web Developer tools for it – using shift+ctrl+f, you can hover over elements and see a very helpful breakdown of the heirarchy of containing elements for that element – which makes it ever so much easier to determine what to modify.

Editing the wp-admin.css is what I eventually did. Once I got started it was easy. I used the IE web developer tool to identify culprits. Trial and error mostly. Just save a backup copy of your original file.