Example video
Here we go:
'Sweetness' (Michelle Gayle)
Michelle Patricia Gayle is a British singer, songwriter, actress and author. She enjoyed success as a soul and R&B singer in the 1990s. As an actress, Michelle Gayle is known for her work on television but she's also had various roles in film and theatre. The rights to her first novel, Pride and Premiership, were acquired by Walker Books. The book was published in 2011.
The markup:
<div class="w1200"><!-- if the video is wider than 740px //--> <div class="video"> <video class="bgmaxw3" width="992" height="auto" autoplay controls loop> <source src="./video/cms-sweetness.mp4" type="video/mp4"> Your browser does not support the video tag. </video> </div> <p class="caption">BBC Top of the Pops, 1990s</p> </div><!-- if the video is wider than 740px //-->
Upload MP4 video files to the /video/ folder. In the markup, try to get the width right.