Schau dir mal https://getbootstrap.com/docs/4.0/utilities/embed/ an, da kannst
du dir das CSS abgucken.
embed-responsive {
position: relative;
display: block;
width: 100%;
padding: 0;
overflow: hidden;
}
embed-responsive .embed-responsive-item, .embed-responsive embed,
.embed-responsive iframe, .embed-responsive object, .embed-responsive video {
position: absolute;
top: 0;
bottom: 0;
left: 0;
width: 100%;
height: 100%;
border: 0;
}
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