How to scroll the page when a modal dialog is longer than the screen?

Question

I have a modal dialog in my app which can get quite long in the y direction. This introduces a problem whereby some of the content of the dialog is hidden off the bottom of

Answer 1

In the end I had had to make changes to the content of the page behind the modal screen to ensure that it never got long enough to scroll the page.

Once I did that, the problems I encountered when applying position: absolute to the dialog were resolved as the user could no longer scroll down the page.