Cacher is the code snippet organizer for pro developers

<div class="video-container">
<iframe width="560" height="315" src="https://www.youtube.com/embed/571yiNrFDYI" frameborder="0" allowfullscreen></iframe>
</div>

.video-container {
    position: relative;
    padding-bottom: 56.25%;
    padding-top: 35px;
    height: 0;
    overflow: hidden;
}

.video-container iframe {
    position: absolute;
    top:0;
    left: 0;
    width: 100%;
    height: 100%;
}