<style> .video-container { position: relative; padding-bottom: 56.25%; } .video-container iframe { position: absolute; top: 0; left: 0; width: 100%; height: 100%; } </style> <div class="video-container"> <iframe src="https://www.youtube.com/embed/msizPweg3kE" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope;" allowfullscreen></iframe> </div>