<iframe src='https://example.com/calculator' width='300' height='400'></iframe>

<iframe src='https://example.com/unit-converter' width='320' height='350'></iframe>

<iframe src='https://example.com/calendar' width='400' height='400'></iframe>

<iframe src='https://example.com/timer' width='280' height='300'></iframe>

<iframe src='https://example.com/notepad' width='350' height='400'></iframe>