.wy-nav-content {
    max-width: none;
}

/*
https://www.h3xed.com/web-development/how-to-make-a-responsive-100-width-youtube-iframe-embed
https://stackoverflow.com/questions/52393814/css-100-width-of-youtube-embed-video 
*/
.container {
    position: relative;
    width: 100%;
    height: 0;
    padding-bottom: 56.25%;
}
.video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}