<!-- 16:9 aspect ratio -->
<div style="max-width: 770px">
<div class="embed-responsive embed-responsive-16by9">
<iframe width="770" height="433" src="//www.youtube.com/embed/hoRH32HYGHI" frameborder="0" allowfullscreen></iframe>
</div>
</div>
<!-- 16:9 aspect ratio -->
<div style="max-width: 640px">
<div class="embed-responsive embed-responsive-16by9">
<iframe width="640" height="360" src="//www.youtube.com/embed/hoRH32HYGHI" frameborder="0" allowfullscreen></iframe>
</div>
</div>
<!-- 16:9 aspect ratio -->
<div style="max-width: 460px">
<div class="embed-responsive embed-responsive-16by9">
<iframe width="460" height="259" src="//www.youtube.com/embed/hoRH32HYGHI" frameborder="0" allowfullscreen></iframe>
</div>
</div>
<div class="row">
<div class="col-md-6">
<div class="embed-responsive embed-responsive-16by9">
<iframe frameborder="0" width="366" height="206" src="//www.youtube.com/embed/hoRH32HYGHI"></iframe>
</div>
</div>
<div class="col-md-6">
<div class="embed-responsive embed-responsive-16by9">
<iframe frameborder="0" width="366" height="206" src="//www.youtube.com/embed/hoRH32HYGHI"></iframe>
</div>
</div>
</div>