<style>

    .embed-container {

        position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%;

    }

    .embed-container iframe,

    .embed-container object,

    .embed-container embed {

        position: absolute; top: 0; left: 0; width: 100%; height: 100%;

    }

</style>

<div class="embed-container">

    <iframe src="https://www.youtube.com/embed/Ov2wuLGmmH4" frameborder="0" allowfullscreen="" mozallowfullscreen="" webkitallowfullscreen=""></iframe>

</div>