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twbs--bootstrap/scss/helpers/_embed.scss

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SCSS

// Credit: Nicolas Gallagher and SUIT CSS.
.embed-responsive {
position: relative;
width: 100%;
&::before {
display: block;
content: "";
}
.embed-responsive-item,
iframe,
embed,
object,
video {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
border: 0;
}
}
@each $key, $ratio in $embed-responsive-aspect-ratios {
.embed-responsive-#{$key} {
&::before {
padding-top: percentage(map-get($ratio, y) / map-get($ratio, x));
}
}
}