need smal optimization, for videos backgorund art space white tone convert to black. add this css code in add-on "article > div > div > div > div > div > div > div > div > div > div > video, article div div div div div div div div div div video {background-color: #000;opacity: 1;}

The best dark theme for instagram in my opinion because it even has a black font when you reload the page. The background could be a little "grayer" in my opinion so that there is a better distinction between the background and the photo frames.