This is what I have so far. No matter how I add the border-radius property, it has no effect.
<div class="videotar_video">
<iframe src="//www.youtube.com/embed/hqiNL4Hn04A" frameborder="0"></iframe>
</div>
.videotar_video
{
border: solid white;
border-top-width: 15px;
border-bottom-width: 15px;
border-left-width: 28px;
border-right-width: 28px;
position: relative;
padding-bottom: 56.25%; /* 16:9 */
padding-top: 5px;
height: 0;
}
.videotar_video iframe
{
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
}