Embed full, live websites to your board, here's how:
Add a new iFrame
Click on the ‘+’ at the bottom of the board and drag in the ‘Embed media’ icon. Grab the URL of the website you’d like to add, paste it in, and click the tick (or just hit enter).
You can scale items up by hitting the ‘enlarge’ button, or use the toggles at the side and bottom of the iFrame to resize it manually.