Bootstrap responsive embed

<div class="embed-responsive [responsivetype]">
<iframe class="embed-responsive-item" src="https://www.youtube.com/embed/e6cSOtcc6l0?rel=0&amp;showinfo=0" frameborder="0" allowfullscreen></iframe>
</div>

[responsivetype] poate fi embed-responsive-4by3 sau embed-responsive-16by9

Pentru alte [responsivetype] adaptati CSS-ul dupa modelul :

.embed-responsive-square {
    border: 1px solid #eee;
    padding-bottom: 100%;
    position: relative;
}