This is an old Yii script. It's similar to Pinterest
We made Contact us, Login, and FB / Twitter Sign-up forms into lightboxes.
Old style: [url removed, login to view]
New style: [url removed, login to view]
Twitter and FB has 2-part registration. But the last guy added the lightbox form for only the 1st part of registration.
2nd part of Twitter or FB registration still use old template: [url removed, login to view] << this is the old sign-up. This is how it should look: [url removed, login to view]
I will provide the new forms with CSS, but for example only. You will use current CSS and assets to create new form.
The script is Yii but they built another framework on top: [url removed, login to view] Now the structure is strange. They added something called worklets. So it takes time to find files.
They also use poor CSS structure. When you change one page, you break another page. The good news is that we fixed 95% of this, but not all.