<section id="sect_sel">
<video id="video" autoplay="autoplay" loop="loop" preload="auto" muted>
<source src="_images/rest.mp4"></source>
</video>
</section>
section {
display: block;
width: 100%;
height: 200px;
overflow: hidden;
}
video {
display: block;
width: 100%;
}