How to make in-built slideshare iframe responsive?

[denisbook]

I added my presentation to website (here). I used slideshare iframe with code:

<iframe src="//www.slideshare.net/slideshow/embed_code/key/HQoiz6GR1oLe1n" width="860" height="600" frameborder="600" marginwidth="0" marginheight="0" scrolling="no" style="border:1px solid #CCC; border-width:1px; margin-bottom:5px; max-width: 100%;" allowfullscreen> </iframe>

Style

height="600"

cause black areas around presentation in mobile version:

How to make iframe responsive?