encantar-js/docs_overrides/style/lite-yt-embed.css

lite-youtube {
    background-color: #000;
    position: relative;
    display: block;
    contain: content;
    background-position: center center;
    background-size: cover;
    cursor: pointer;
    max-width: 720px;
}

/* gradient */
lite-youtube::before {
    content: attr(data-title);
    display: block;
    position: absolute;
    top: 0;
    /* Pixel-perfect port of YT's gradient PNG, using https://github.com/bluesmoon/pngtocss plus optimizations */
    background-image: linear-gradient(180deg, rgb(0 0 0 / 67%) 0%, rgb(0 0 0 / 54%) 14%, rgb(0 0 0 / 15%) 54%, rgb(0 0 0 / 5%) 72%, rgb(0 0 0 / 0%) 94%);
    height: 99px;
    width: 100%;
    font-family: "YouTube Noto",Roboto,Arial,Helvetica,sans-serif;
    color: hsl(0deg 0% 93.33%);
    text-shadow: 0 0 2px rgba(0,0,0,.5);
    font-size: 18px;
    padding: 25px 20px;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
    box-sizing: border-box;
}

lite-youtube:hover::before {
    color: white;
}

/* responsive iframe with a 16:9 aspect ratio
    thanks https://css-tricks.com/responsive-iframes/
*/
lite-youtube::after {
    content: "";
    display: block;
    padding-bottom: calc(100% / (16 / 9));
}
lite-youtube > iframe {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    border: 0;
}

/* play button */
lite-youtube > .lyt-playbtn {
    display: block;
    /* Make the button element cover the whole area for a large hover/click target… */
    width: 100%;
    height: 100%;
    /* …but visually it's still the same size */
    background: no-repeat center/68px 48px;
    /* YT's actual play button svg */
    background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 68 48"><path d="M66.52 7.74c-.78-2.93-2.49-5.41-5.42-6.19C55.79.13 34 0 34 0S12.21.13 6.9 1.55c-2.93.78-4.63 3.26-5.42 6.19C.06 13.05 0 24 0 24s.06 10.95 1.48 16.26c.78 2.93 2.49 5.41 5.42 6.19C12.21 47.87 34 48 34 48s21.79-.13 27.1-1.55c2.93-.78 4.64-3.26 5.42-6.19C67.94 34.95 68 24 68 24s-.06-10.95-1.48-16.26z" fill="red"/><path d="M45 24 27 14v20" fill="white"/></svg>');
    position: absolute;
    cursor: pointer;
    z-index: 1;
    filter: grayscale(100%);
    transition: filter .1s cubic-bezier(0, 0, 0.2, 1);
    border: 0;
}

lite-youtube:hover > .lyt-playbtn,
lite-youtube .lyt-playbtn:focus {
    filter: none;
}

/* Post-click styles */
lite-youtube.lyt-activated {
    cursor: unset;
}
lite-youtube.lyt-activated::before,
lite-youtube.lyt-activated > .lyt-playbtn {
    opacity: 0;
    pointer-events: none;
}

.lyt-visually-hidden {
    clip: rect(0 0 0 0);
    clip-path: inset(50%);
    height: 1px;
    overflow: hidden;
    position: absolute;
    white-space: nowrap;
    width: 1px;
  }