Custom pages when migrating to new experience

We are preparing to migrate from the old platform to the new experience. We've made recent changes to one of our existing custom pages (https://data.townofcary.org/page/storydirectory/) by updating HTML/CSS in the main content area between the navigation menu bar and the footer. Do we need to do anything now to ensure the current content on this page will display once we migrate to the new experience? (We have about 10 custom pages in the same situation.)