Video youtube, vista pc y móvil

Código

<style>
.clas_iframe .container {
position: relative;
overflow: hidden;
width: 100%;
padding-top: 56.25%;
}
.responsive-iframe {
position: absolute;
top: 0;
left: 0;
bottom: 0;
right: 0;
width: 100%;
height: 100%;
}
</style>


<div class="clas_iframe">
<div class="container">
<iframe class="responsive-iframe" width="560" height="315" src="https://www.youtube.com/embed/U0xDRXbESAg?rel=0&autoplay=1" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen=""></iframe>
</div>
</div>