The HTML can be placed in an unformatted text part. 
  1. Edit a page to place the part on. Ideally, this would be a blank page with no other styles.
  2. In an content pane, click New Part
  3. For part type, select Unformatted Text
  4. Copy/paste the html into the Unformatted text part
  5. Click Save
  6. Click View This Page