.yt-shorts {
    position: relative;
    padding-bottom: 177.78%;
    margin: 0 auto;
    overflow: hidden;
}
.yt-shorts iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

.yt-standard {
    position: relative;
    padding-bottom: 56.25%;
    margin: 0 auto;
    overflow: hidden;
}
.yt-standard iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
}