When you embed a Vimeo video on a WordPress web site by using a short code, there’s only an option to pass in a static width and height. In this responsive world, I tried this out using 100% as the width, but that didn’t work. My wife’s emoticakes.com WordPress site had a video that looked great, but on mobile the video’s fixed width blew it out of the content area, rendering the text around it incredibly small.
My solution uses CSS as a workaround. This snippet of code, if you add it to your WordPress theme’s CSS, will make the video scale to a maximum of the container’s width. Further, since the video letterboxes if the aspect ratio doesn’t match the video player’s dimensions, it sets a maximum height if the viewport is less than 600 pixels wide. The result, shown at right, is oh-so-sweet.