You can fix this one of two ways, either by adjusting the max height of the embed code, or changing scrolling to yes. To do this navigate to:
  1. onMessage > Website > Site Name
  2. Click the Editing Wrench next to the Page the Embed Code is on and click Edit Page Content
  3. Click the Gear Icon in the Embed Widget
  4. Change scrolling="no" to scrolling="yes" OR change the height (for example if it says " width="800" height="1700", change the height of 1700 to something larger to support how high you will need the page to be, such as 2500 or 3000
  5. Click Save
  6. Click Apply Changes in the bottom right hand side of  the "Edit Page Content" page to apply the changes to the live site