SKY Page Add-In cannot occupy full available viewport height

Steven Lopresti

Hi,

We are developing an RE NXT Page Add-In and can't get it to occupy the full available viewport height (minus the RE NXT navbar) as indicated in the Page Add-Ins documentation: https://developer.blackbaud.com/skyapi/docs/addins/get-started/page-addins

Fixed pixel heights do render correctly but aren’t responsive, so are a no-go. Content-driven auto-resizing works but sizes to content rather than the available viewport height, so that too isn't good. Using viewport height units (vh) inside the add-in targets the add-in’s iFrame rather than the user’s browser viewport, preventing a true “full available height” layout.

Adjusting CSS directly on the host iFrame in the browser works beautifully and yields the desired full-height behavior, suggesting the solution requires container/iFrame-level sizing support.

Has anyone else encountered this issue or gotten it to work?

Thank you!

(Below screenshot is what we have now with fixed pixel height.)