.youtube-player{position:relative;padding-bottom:56.25%;height:0;overflow:hidden;max-width:100%}.youtube-player iframe{position:absolute;top:0;left:0;width:100%;height:100%}.auto-play-toggle{background-color:#f0f0f0;border:1px solid #ccc;padding:10px 15px;cursor:pointer;transition:background-color .3s}.auto-play-toggle.active{background-color:#4caf50;color:#fff}