.youtube {
    aspect-ratio: 16/9;
}


.youtube iframe {
    left: 0;
    top: 0;
    margin: 0;
    bordeR: 0;
    padding: 0;
}

.previewHolder {
    background-position: center;
    background-size: cover;
}

.youtube.cornered {
    margin:0.25rem;
    overflow:hidden;
    border-radius: 0.25rem;
    background: black;
}

.youtube.cornered .previewHolder {
    position: static;
}