html, body {    margin: 0;
                padding: 0;
                background: #000;
                overflow: hidden;
            }

            #fullscreen {
              position: fixed;
              top: 0;
              right: 0;
              bottom: 0;
              left: 0;
              background-color: black;
              display: flex;
              justify-content: center;
              align-items: center;
            }

            #fullscreen canvas {
              object-fit: contain;
              max-height: 100%;
              max-width: 100%;
            }