.youtube_shorts_item {
    position: relative;
    overflow: hidden;
    border-radius: 1em;
}
.youtube_shorts_item:before {
    content: '';
    display: block;
    padding-top: 177.78%;
}
.youtube_shorts_item iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
    z-index: 1;
}