html, body {
    margin: 0px;
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: monospace;
    cursor: crosshair;
}
a:visited, a:link, a:active {
    color: black;
}
/* But it is not enough now, below dont hide play button parent div */
*::-webkit-media-controls-panel {
  display: none!important;
  -webkit-appearance: none;
}

/* Old shadow dom for play button */
*::--webkit-media-controls-play-button {
  display: none!important;
  -webkit-appearance: none;
}

/* New shadow dom for play button */
/* This one works */
*::-webkit-media-controls-start-playback-button {
  display: none!important;
  -webkit-appearance: none;
}