I’ve implemented the alterations necessary to create a fully blank page template for my site, as discussed here: https://forum.tagdiv.com/topic/how-do-i-create-a-completely-blank-page/
When I do this and incorporate an iframe video that’s been responsive to take up the entire screen on other themes, the video only fills the container width properly, but only fills a small section of the height of the screen, like so: http://sparrowvideo.co/homepage-big-slide/
For our needs, it is necessary to be able to fill a container that is responsive to whatever device the video will load on. Here is an example link to what exactly we are going for: https://espn.go.com/video/iframe/twitter/?cms=espn&id=14513772
Are there any CSS alterations or PHP integrations that we can perform to get this done? This is an extremely important aspect of our website. Also, if at all possible, we would like to accomplish this with posts, not pages.
UPDATE: I’ve managed to make the video player responsively fit the entire screen by injecting the code and CSS into the header of the page, as seen here: http://sparrowvideo.co/homepage-blog/
My issue is now that there is a blank white line appearing across the top of the screen, which I am assuming is the body of the blank page template I am using. If I could somehow get rid of that white bar now, all of my issues would be solved. Thanks so much for your help!