it works just the same for vimeo - click share then copy the embed code then change the height and width to 100% in the placeholder code then click apply then adjust the size of the video accordingly .

<iframe src="//player.vimeo.com/video/93877492?title=0&amp;byline=0&amp;portrait=0&amp;b adge=0&amp;color=ffffff" width="100%" height="100%" frameborder="0" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe> <p><a href="http://vimeo.com/93877492">kidkanevil 'Inakunaru Feat. Phasma'</a> from <a href="http://vimeo.com/takcom">takcom&trade;</a> on <a href="https://vimeo.com">Vimeo</a>.</p>